Initial Commit

.gitignore

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+__sysdb__.sqlite
+Electrum.sqlite
+XO.sqlite
+node_modules/
+dist/

package.json

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+{
+  "name": "@xo-cash/cli",
+  "version": "1.0.0",
+  "main": "dist/index.js",
+  "type": "module",
+  "scripts": {
+    "dev": "tsx src/index.ts",
+    "build": "tsc",
+    "start": "SYNC_SERVER_URL=https://sync.xo.harvmaster.com node dist/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "crypto",
+    "wallet",
+    "cli",
+    "tui"
+  ],
+  "author": "General Protocols",
+  "license": "ISC",
+  "description": "XO Wallet CLI - Terminal User Interface for XO crypto wallet",
+  "dependencies": {
+    "@bitauth/libauth": "^3.0.0",
+    "@xo-cash/engine": "file:../engine",
+    "@xo-cash/state": "file:../state",
+    "@xo-cash/templates": "file:../templates",
+    "@xo-cash/types": "file:../types",
+    "clipboardy": "^5.1.0",
+    "ink": "^5.1.0",
+    "ink-select-input": "^6.0.0",
+    "ink-spinner": "^5.0.0",
+    "ink-text-input": "^6.0.0",
+    "react": "^18.3.1"
+  },
+  "devDependencies": {
+    "@types/node": "^25.0.10",
+    "@types/react": "^18.3.18",
+    "tsx": "^4.21.0",
+    "typescript": "^5.9.3"
+  }
+}

src/app.ts

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+/**
+ * Application bootstrap and lifecycle management.
+ * Coordinates initialization of all CLI components.
+ */
+
+import React from 'react';
+import { render, type Instance } from 'ink';
+import { App as AppComponent } from './tui/App.js';
+import { WalletController } from './controllers/wallet-controller.js';
+import { InvitationController } from './controllers/invitation-controller.js';
+import { SyncClient } from './services/sync-client.js';
+
+/**
+ * Configuration options for the CLI application.
+ */
+export interface AppConfig {
+  /** URL of the sync server (default: http://localhost:3000) */
+  syncServerUrl?: string;
+  /** Database path for wallet state storage */
+  databasePath?: string;
+  /** Database filename */
+  databaseFilename?: string;
+}
+
+/**
+ * Main application class that orchestrates all CLI components.
+ */
+export class App {
+  /** Ink render instance */
+  private inkInstance: Instance | null = null;
+  
+  /** Wallet controller for engine operations */
+  private walletController: WalletController;
+  
+  /** Invitation controller for collaborative transactions */
+  private invitationController: InvitationController;
+  
+  /** HTTP client for sync server communication */
+  private syncClient: SyncClient;
+  
+  /** Application configuration */
+  private config: Required<AppConfig>;
+
+  /**
+   * Creates a new App instance.
+   * @param config - Application configuration options
+   */
+  private constructor(config: AppConfig = {}) {
+    // Set default configuration
+    this.config = {
+      syncServerUrl: config.syncServerUrl ?? 'http://localhost:3000',
+      databasePath: config.databasePath ?? './',
+      databaseFilename: config.databaseFilename ?? 'xo-wallet',
+    };
+
+    // Initialize sync client
+    this.syncClient = new SyncClient(this.config.syncServerUrl);
+
+    // Initialize wallet controller (engine will be created when seed is provided)
+    this.walletController = new WalletController({
+      databasePath: this.config.databasePath,
+      databaseFilename: this.config.databaseFilename,
+    });
+
+    // Initialize invitation controller
+    this.invitationController = new InvitationController(
+      this.walletController,
+      this.syncClient,
+    );
+  }
+
+  /**
+   * Factory method to create and start the application.
+   * @param config - Application configuration options
+   * @returns Running App instance
+   */
+  static async create(config: AppConfig = {}): Promise<App> {
+    const app = new App(config);
+    await app.start();
+    return app;
+  }
+
+  /**
+   * Starts the application.
+   * Renders the Ink-based TUI.
+   */
+  async start(): Promise<void> {
+    // Render the Ink app
+    this.inkInstance = render(
+      React.createElement(AppComponent, {
+        walletController: this.walletController,
+        invitationController: this.invitationController,
+      })
+    );
+
+    // Wait for the app to exit
+    await this.inkInstance.waitUntilExit();
+  }
+
+  /**
+   * Stops the application and cleans up resources.
+   */
+  async stop(): Promise<void> {
+    // Stop the wallet engine if running
+    await this.walletController.stop();
+    
+    // Unmount Ink app
+    if (this.inkInstance) {
+      this.inkInstance.unmount();
+      this.inkInstance = null;
+    }
+  }
+
+  /**
+   * Gets the wallet controller for external access.
+   */
+  getWalletController(): WalletController {
+    return this.walletController;
+  }
+
+  /**
+   * Gets the invitation controller for external access.
+   */
+  getInvitationController(): InvitationController {
+    return this.invitationController;
+  }
+
+  /**
+   * Gets the sync client for external access.
+   */
+  getSyncClient(): SyncClient {
+    return this.syncClient;
+  }
+}

src/controllers/invitation-controller.ts

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+/**
+ * Invitation Controller - High-level interface for invitation management.
+ * 
+ * Provides a simplified API for the TUI to interact with invitations,
+ * wrapping the InvitationFlowManager and coordinating with the WalletController.
+ */
+
+import { EventEmitter } from 'events';
+import type { XOInvitation } from '@xo-cash/types';
+import { InvitationFlowManager, type TrackedInvitation, type InvitationState } from '../services/invitation-flow.js';
+import type { WalletController } from './wallet-controller.js';
+import type { SyncClient } from '../services/sync-client.js';
+
+/**
+ * Events emitted by the invitation controller.
+ */
+export interface InvitationControllerEvents {
+  'invitation-created': (invitationId: string) => void;
+  'invitation-updated': (invitationId: string) => void;
+  'invitation-state-changed': (invitationId: string, state: InvitationState) => void;
+  'error': (error: Error) => void;
+}
+
+/**
+ * Controller for managing invitations in the TUI.
+ */
+export class InvitationController extends EventEmitter {
+  /** Flow manager for invitation lifecycle */
+  private flowManager: InvitationFlowManager;
+  
+  /** Wallet controller reference */
+  private walletController: WalletController;
+  
+  /** Sync client reference */
+  private syncClient: SyncClient;
+
+  /**
+   * Creates a new invitation controller.
+   * @param walletController - Wallet controller instance
+   * @param syncClient - Sync client instance
+   */
+  constructor(walletController: WalletController, syncClient: SyncClient) {
+    super();
+    
+    this.walletController = walletController;
+    this.syncClient = syncClient;
+    this.flowManager = new InvitationFlowManager(walletController, syncClient);
+
+    // Forward events from flow manager
+    this.flowManager.on('invitation-created', (invitation: XOInvitation) => {
+      this.emit('invitation-created', invitation.invitationIdentifier);
+    });
+
+    this.flowManager.on('invitation-updated', (invitationId: string) => {
+      this.emit('invitation-updated', invitationId);
+    });
+
+    this.flowManager.on('invitation-state-changed', (invitationId: string, state: InvitationState) => {
+      this.emit('invitation-state-changed', invitationId, state);
+    });
+
+    this.flowManager.on('error', (_invitationId: string, error: Error) => {
+      this.emit('error', error);
+    });
+  }
+
+  // ============================================================================
+  // Invitation Creation Flow
+  // ============================================================================
+
+  /**
+   * Creates a new invitation from a template action.
+   * @param templateIdentifier - Template ID
+   * @param actionIdentifier - Action ID
+   * @returns Created tracked invitation
+   */
+  async createInvitation(
+    templateIdentifier: string,
+    actionIdentifier: string,
+  ): Promise<TrackedInvitation> {
+    return this.flowManager.createInvitation(templateIdentifier, actionIdentifier);
+  }
+
+  /**
+   * Publishes an invitation to the sync server and starts listening for updates.
+   * @param invitationId - Invitation ID to publish
+   * @returns The invitation ID for sharing
+   */
+  async publishAndSubscribe(invitationId: string): Promise<string> {
+    // Publish to sync server
+    await this.flowManager.publishInvitation(invitationId);
+    
+    // Subscribe to SSE updates
+    await this.flowManager.subscribeToUpdates(invitationId);
+
+    return invitationId;
+  }
+
+  // ============================================================================
+  // Invitation Import Flow
+  // ============================================================================
+
+  /**
+   * Imports an invitation by ID from the sync server.
+   * @param invitationId - Invitation ID to import
+   * @returns Imported tracked invitation
+   */
+  async importInvitation(invitationId: string): Promise<TrackedInvitation> {
+    return this.flowManager.importInvitation(invitationId);
+  }
+
+  /**
+   * Accepts an imported invitation (joins as participant).
+   * @param invitationId - Invitation ID to accept
+   * @returns Updated tracked invitation
+   */
+  async acceptInvitation(invitationId: string): Promise<TrackedInvitation> {
+    return this.flowManager.acceptInvitation(invitationId);
+  }
+
+  // ============================================================================
+  // Invitation Data Operations
+  // ============================================================================
+
+  /**
+   * Appends inputs to an invitation.
+   * @param invitationId - Invitation ID
+   * @param inputs - Inputs to add
+   */
+  async addInputs(
+    invitationId: string,
+    inputs: Array<{
+      outpointTransactionHash: string;
+      outpointIndex: number;
+      sequenceNumber?: number;
+    }>,
+  ): Promise<TrackedInvitation> {
+    return this.flowManager.appendToInvitation(invitationId, { inputs });
+  }
+
+  /**
+   * Appends outputs to an invitation.
+   * @param invitationId - Invitation ID
+   * @param outputs - Outputs to add
+   */
+  async addOutputs(
+    invitationId: string,
+    outputs: Array<{
+      valueSatoshis?: bigint;
+      lockingBytecode?: Uint8Array;
+      outputIdentifier?: string;
+      roleIdentifier?: string;
+    }>,
+  ): Promise<TrackedInvitation> {
+    return this.flowManager.appendToInvitation(invitationId, { outputs });
+  }
+
+  /**
+   * Appends variables to an invitation.
+   * @param invitationId - Invitation ID
+   * @param variables - Variables to add
+   */
+  async addVariables(
+    invitationId: string,
+    variables: Array<{
+      variableIdentifier: string;
+      value: bigint | boolean | number | string;
+      roleIdentifier?: string;
+    }>,
+  ): Promise<TrackedInvitation> {
+    return this.flowManager.appendToInvitation(invitationId, { variables });
+  }
+
+  // ============================================================================
+  // Signing & Broadcasting
+  // ============================================================================
+
+  /**
+   * Signs an invitation.
+   * @param invitationId - Invitation ID to sign
+   * @returns Updated tracked invitation
+   */
+  async signInvitation(invitationId: string): Promise<TrackedInvitation> {
+    return this.flowManager.signInvitation(invitationId);
+  }
+
+  /**
+   * Broadcasts the transaction for an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Transaction hash
+   */
+  async broadcastTransaction(invitationId: string): Promise<string> {
+    return this.flowManager.broadcastTransaction(invitationId);
+  }
+
+  // ============================================================================
+  // Queries
+  // ============================================================================
+
+  /**
+   * Gets a tracked invitation by ID.
+   * @param invitationId - Invitation ID
+   * @returns Tracked invitation or undefined
+   */
+  getInvitation(invitationId: string): TrackedInvitation | undefined {
+    return this.flowManager.get(invitationId);
+  }
+
+  /**
+   * Gets all tracked invitations.
+   * @returns Array of tracked invitations
+   */
+  getAllInvitations(): TrackedInvitation[] {
+    return this.flowManager.getAll();
+  }
+
+  /**
+   * Gets the invitation data.
+   * @param invitationId - Invitation ID
+   * @returns The XOInvitation or undefined
+   */
+  getInvitationData(invitationId: string): XOInvitation | undefined {
+    return this.flowManager.get(invitationId)?.invitation;
+  }
+
+  /**
+   * Gets the state of an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Invitation state or undefined
+   */
+  getInvitationState(invitationId: string): InvitationState | undefined {
+    return this.flowManager.get(invitationId)?.state;
+  }
+
+  /**
+   * Gets available roles for an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Array of available role identifiers
+   */
+  async getAvailableRoles(invitationId: string): Promise<string[]> {
+    const tracked = this.flowManager.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+    return this.walletController.getAvailableRoles(tracked.invitation);
+  }
+
+  /**
+   * Gets missing requirements for an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Missing requirements
+   */
+  async getMissingRequirements(invitationId: string) {
+    const tracked = this.flowManager.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+    return this.walletController.getMissingRequirements(tracked.invitation);
+  }
+
+  /**
+   * Gets requirements for an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Requirements
+   */
+  async getRequirements(invitationId: string) {
+    const tracked = this.flowManager.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+    return this.walletController.getRequirements(tracked.invitation);
+  }
+
+  // ============================================================================
+  // Cleanup
+  // ============================================================================
+
+  /**
+   * Stops tracking an invitation.
+   * @param invitationId - Invitation ID to stop tracking
+   */
+  stopTracking(invitationId: string): void {
+    this.flowManager.untrack(invitationId);
+  }
+
+  /**
+   * Cleans up all resources.
+   */
+  destroy(): void {
+    this.flowManager.destroy();
+  }
+}

src/controllers/wallet-controller.ts

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+/**
+ * Wallet Controller - Orchestrates wallet operations via the XO Engine.
+ * 
+ * Responsibilities:
+ * - Initializes Engine with user seed
+ * - Exposes wallet state queries (balances, UTXOs)
+ * - Delegates template/invitation operations to Engine
+ * - Emits state change events for UI updates
+ */
+
+import { EventEmitter } from 'events';
+import { Engine } from '@xo-cash/engine';
+import type { XOInvitation, XOTemplate, XOTemplateStartingActions } from '@xo-cash/types';
+import type { UnspentOutputData, LockingBytecodeData } from '@xo-cash/state';
+import { p2pkhTemplate } from '@xo-cash/templates';
+
+/**
+ * Configuration options for the wallet controller.
+ */
+export interface WalletControllerConfig {
+  /** Path for database storage */
+  databasePath?: string;
+  /** Database filename */
+  databaseFilename?: string;
+  /** Electrum application identifier */
+  electrumApplicationIdentifier?: string;
+}
+
+/**
+ * Balance information for display.
+ */
+export interface WalletBalance {
+  /** Total satoshis across all UTXOs */
+  totalSatoshis: bigint;
+  /** Number of UTXOs */
+  utxoCount: number;
+}
+
+/**
+ * Events emitted by the wallet controller.
+ */
+export interface WalletControllerEvents {
+  'initialized': () => void;
+  'state-updated': () => void;
+  'error': (error: Error) => void;
+}
+
+/**
+ * Controller for wallet operations.
+ */
+export class WalletController extends EventEmitter {
+  /** The XO Engine instance */
+  private engine: Engine | null = null;
+  
+  /** Controller configuration */
+  private config: WalletControllerConfig;
+  
+  /** Whether the wallet is initialized */
+  private initialized: boolean = false;
+
+  /**
+   * Creates a new wallet controller.
+   * @param config - Controller configuration options
+   */
+  constructor(config: WalletControllerConfig = {}) {
+    super();
+    this.config = config;
+  }
+
+  /**
+   * Checks if the wallet is initialized.
+   */
+  isInitialized(): boolean {
+    return this.initialized && this.engine !== null;
+  }
+
+  /**
+   * Initializes the wallet with a seed phrase.
+   * @param seed - BIP39 seed phrase
+   */
+  async initialize(seed: string): Promise<void> {
+    try {
+      // Create the engine with the provided seed
+      this.engine = await Engine.create(seed, {
+        databasePath: this.config.databasePath ?? './',
+        databaseFilename: this.config.databaseFilename ?? 'xo-wallet',
+        electrumApplicationIdentifier: this.config.electrumApplicationIdentifier ?? 'xo-wallet-cli',
+      });
+
+      // Import the default P2PKH template
+      await this.engine.importTemplate(p2pkhTemplate);
+
+      // Set default locking parameters for P2PKH
+      await this.engine.setDefaultLockingParameters(
+        await this.getTemplateIdentifier(p2pkhTemplate),
+        'receiveOutput',
+        'receiver',
+      );
+
+      // Generate an initial receiving address
+      const templateId = await this.getTemplateIdentifier(p2pkhTemplate);
+      await this.engine.generateLockingBytecode(templateId, 'receiveOutput', 'receiver');
+
+      this.initialized = true;
+      this.emit('initialized');
+    } catch (error) {
+      this.emit('error', error instanceof Error ? error : new Error(String(error)));
+      throw error;
+    }
+  }
+
+  /**
+   * Gets the template identifier from a template.
+   * @param template - The XO template
+   * @returns The template identifier
+   */
+  private async getTemplateIdentifier(template: XOTemplate): Promise<string> {
+    // Import the utility to generate template identifier
+    const { generateTemplateIdentifier } = await import('@xo-cash/engine');
+    return generateTemplateIdentifier(template);
+  }
+
+  /**
+   * Stops the wallet engine and cleans up resources.
+   */
+  async stop(): Promise<void> {
+    if (this.engine) {
+      await this.engine.stop();
+      this.engine = null;
+      this.initialized = false;
+    }
+  }
+
+  /**
+   * Gets the engine instance.
+   * @throws Error if engine is not initialized
+   */
+  getEngine(): Engine {
+    if (!this.engine) {
+      throw new Error('Wallet not initialized. Please enter your seed phrase first.');
+    }
+    return this.engine;
+  }
+
+  // ============================================================================
+  // Balance & UTXO Operations
+  // ============================================================================
+
+  /**
+   * Gets the wallet balance.
+   * @returns Wallet balance information
+   */
+  async getBalance(): Promise<WalletBalance> {
+    const engine = this.getEngine();
+    const utxos = await engine.listUnspentOutputsData();
+    
+    const totalSatoshis = utxos.reduce(
+      (sum, utxo) => sum + BigInt(utxo.valueSatoshis),
+      BigInt(0),
+    );
+
+    return {
+      totalSatoshis,
+      utxoCount: utxos.length,
+    };
+  }
+
+  /**
+   * Gets all unspent outputs.
+   * @returns Array of unspent output data
+   */
+  async getUnspentOutputs(): Promise<UnspentOutputData[]> {
+    const engine = this.getEngine();
+    return engine.listUnspentOutputsData();
+  }
+
+  /**
+   * Gets locking bytecodes for a template.
+   * @param templateIdentifier - Template identifier
+   * @returns Array of locking bytecode data
+   */
+  async getLockingBytecodes(templateIdentifier: string): Promise<LockingBytecodeData[]> {
+    const engine = this.getEngine();
+    return engine.listLockingBytecodesForTemplate(templateIdentifier);
+  }
+
+  // ============================================================================
+  // Template Operations
+  // ============================================================================
+
+  /**
+   * Gets all imported templates.
+   * @returns Array of templates
+   */
+  async getTemplates(): Promise<XOTemplate[]> {
+    const engine = this.getEngine();
+    return engine.listImportedTemplates();
+  }
+
+  /**
+   * Gets a specific template by identifier.
+   * @param templateIdentifier - Template identifier
+   * @returns The template or undefined
+   */
+  async getTemplate(templateIdentifier: string): Promise<XOTemplate | undefined> {
+    const engine = this.getEngine();
+    return engine.getTemplate(templateIdentifier);
+  }
+
+  /**
+   * Gets starting actions for a template.
+   * @param templateIdentifier - Template identifier
+   * @returns Starting actions
+   */
+  async getStartingActions(templateIdentifier: string): Promise<XOTemplateStartingActions> {
+    const engine = this.getEngine();
+    return engine.listStartingActions(templateIdentifier);
+  }
+
+  /**
+   * Imports a template into the wallet.
+   * @param template - Template to import (JSON or object)
+   */
+  async importTemplate(template: unknown): Promise<void> {
+    const engine = this.getEngine();
+    await engine.importTemplate(template);
+    this.emit('state-updated');
+  }
+
+  /**
+   * Generates a new locking bytecode (receiving address).
+   * @param templateIdentifier - Template identifier
+   * @param outputIdentifier - Output identifier
+   * @param roleIdentifier - Role identifier
+   * @returns Generated locking bytecode as hex
+   */
+  async generateLockingBytecode(
+    templateIdentifier: string,
+    outputIdentifier: string,
+    roleIdentifier?: string,
+  ): Promise<string> {
+    const engine = this.getEngine();
+    const lockingBytecode = await engine.generateLockingBytecode(
+      templateIdentifier,
+      outputIdentifier,
+      roleIdentifier,
+    );
+    this.emit('state-updated');
+    return lockingBytecode;
+  }
+
+  // ============================================================================
+  // Invitation Operations
+  // ============================================================================
+
+  /**
+   * Creates a new invitation.
+   * @param templateIdentifier - Template identifier
+   * @param actionIdentifier - Action identifier
+   * @returns Created invitation
+   */
+  async createInvitation(
+    templateIdentifier: string,
+    actionIdentifier: string,
+  ): Promise<XOInvitation> {
+    const engine = this.getEngine();
+    return engine.createInvitation({
+      templateIdentifier,
+      actionIdentifier,
+    });
+  }
+
+  /**
+   * Accepts an invitation.
+   * @param invitation - Invitation to accept
+   * @returns Updated invitation
+   */
+  async acceptInvitation(invitation: XOInvitation): Promise<XOInvitation> {
+    const engine = this.getEngine();
+    return engine.acceptInvitation(invitation);
+  }
+
+  /**
+   * Appends data to an invitation.
+   * @param invitation - Invitation to append to
+   * @param params - Data to append
+   * @returns Updated invitation
+   */
+  async appendInvitation(
+    invitation: XOInvitation,
+    params: {
+      inputs?: Array<{
+        outpointTransactionHash?: string;
+        outpointIndex?: number;
+        sequenceNumber?: number;
+        mergesWith?: { commitIdentifier: string; index: number };
+        unlockingBytecode?: Uint8Array;
+      }>;
+      outputs?: Array<{
+        valueSatoshis?: bigint;
+        lockingBytecode?: Uint8Array;
+        outputIdentifier?: string;
+        roleIdentifier?: string;
+        mergesWith?: { commitIdentifier: string; index: number };
+      }>;
+      variables?: Array<{
+        variableIdentifier: string;
+        value: bigint | boolean | number | string;
+        roleIdentifier?: string;
+      }>;
+    },
+  ): Promise<XOInvitation> {
+    const engine = this.getEngine();
+    // Cast through unknown to handle strict type checking from engine's AppendInvitationParameters
+    // The engine expects Uint8Array for outpointTransactionHash but we accept string for convenience
+    return engine.appendInvitation(invitation, params as unknown as Parameters<typeof engine.appendInvitation>[1]);
+  }
+
+  /**
+   * Signs an invitation.
+   * @param invitation - Invitation to sign
+   * @returns Signed invitation
+   */
+  async signInvitation(invitation: XOInvitation): Promise<XOInvitation> {
+    const engine = this.getEngine();
+    return engine.signInvitation(invitation);
+  }
+
+  /**
+   * Validates an invitation.
+   * @param invitation - Invitation to validate
+   * @returns Whether the invitation is valid
+   */
+  async isInvitationValid(invitation: XOInvitation): Promise<boolean> {
+    const engine = this.getEngine();
+    return engine.isInvitationValid(invitation);
+  }
+
+  /**
+   * Gets available roles for an invitation.
+   * @param invitation - Invitation to check
+   * @returns Array of available role identifiers
+   */
+  async getAvailableRoles(invitation: XOInvitation): Promise<string[]> {
+    const engine = this.getEngine();
+    return engine.listAvailableRoles(invitation);
+  }
+
+  /**
+   * Gets requirements for an invitation.
+   * @param invitation - Invitation to check
+   * @returns Requirements information
+   */
+  async getRequirements(invitation: XOInvitation) {
+    const engine = this.getEngine();
+    return engine.listRequirements(invitation);
+  }
+
+  /**
+   * Gets missing requirements for an invitation.
+   * @param invitation - Invitation to check
+   * @returns Missing requirements information
+   */
+  async getMissingRequirements(invitation: XOInvitation) {
+    const engine = this.getEngine();
+    return engine.listMissingRequirements(invitation);
+  }
+
+  /**
+   * Finds suitable UTXOs for an invitation.
+   * @param invitation - Invitation to find resources for
+   * @param options - Search options
+   * @returns Suitable unspent outputs
+   */
+  async findSuitableResources(
+    invitation: XOInvitation,
+    options: { templateIdentifier: string; outputIdentifier: string },
+  ) {
+    const engine = this.getEngine();
+    return engine.findSuitableResources(invitation, options);
+  }
+
+  // ============================================================================
+  // Transaction Operations
+  // ============================================================================
+
+  /**
+   * Executes an action (broadcasts transaction).
+   * @param invitation - Invitation with completed transaction
+   * @param options - Execution options
+   * @returns Transaction hash
+   */
+  async executeAction(
+    invitation: XOInvitation,
+    options: { broadcastTransaction?: boolean } = { broadcastTransaction: true },
+  ): Promise<string> {
+    const engine = this.getEngine();
+    const txHash = await engine.executeAction(invitation, {
+      broadcastTransaction: options.broadcastTransaction ?? true,
+    });
+    
+    if (options.broadcastTransaction) {
+      this.emit('state-updated');
+    }
+    
+    return txHash;
+  }
+}

src/index.ts

@@ -0,0 +1,32 @@
+/**
+ * XO Wallet CLI - Terminal User Interface for XO crypto wallet.
+ * 
+ * Features:
+ * 1. View wallet state and balance
+ * 2. Create invitations for P2PKH transactions
+ * 3. Import and accept invitations
+ * 4. Sign and broadcast transactions
+ * 5. Real-time updates via SSE
+ */
+
+import { App } from './app.js';
+
+/**
+ * Main entry point.
+ */
+async function main(): Promise<void> {
+  try {
+    // Create and start the application
+    await App.create({
+      syncServerUrl: process.env['SYNC_SERVER_URL'] ?? 'http://localhost:3000',
+      databasePath: process.env['DB_PATH'] ?? './',
+      databaseFilename: process.env['DB_FILENAME'] ?? 'xo-wallet',
+    });
+  } catch (error) {
+    console.error('Failed to start XO Wallet CLI:', error);
+    process.exit(1);
+  }
+}
+
+// Run the application
+main();

src/services/invitation-flow.ts

@@ -0,0 +1,435 @@
+/**
+ * Invitation Flow Manager - Manages the collaborative invitation lifecycle.
+ * 
+ * Responsibilities:
+ * - Coordinates between local Engine and remote sync-server
+ * - Subscribes to SSE for real-time updates
+ * - Tracks invitation state machine
+ */
+
+import { EventEmitter } from 'events';
+import type { XOInvitation } from '@xo-cash/types';
+import { SSESession } from '../utils/sse-client.js';
+import type { SyncClient } from './sync-client.js';
+import type { WalletController } from '../controllers/wallet-controller.js';
+import { decodeExtendedJsonObject } from '../utils/ext-json.js';
+
+/**
+ * States an invitation can be in.
+ */
+export type InvitationState = 
+  | 'created'     // Just created locally
+  | 'published'   // Published to sync server
+  | 'pending'     // Waiting for other party
+  | 'ready'       // All requirements met, ready to sign
+  | 'signed'      // Signed and ready to broadcast
+  | 'broadcast'   // Transaction broadcast
+  | 'completed'   // Transaction confirmed
+  | 'expired'     // Invitation expired
+  | 'error';      // Error state
+
+/**
+ * Tracked invitation with state information.
+ */
+export interface TrackedInvitation {
+  /** The invitation data */
+  invitation: XOInvitation;
+  /** Current state */
+  state: InvitationState;
+  /** SSE session for updates (if subscribed) */
+  sseSession?: SSESession;
+  /** Timestamp when tracking started */
+  trackedAt: number;
+  /** Last update timestamp */
+  lastUpdatedAt: number;
+  /** Error message if in error state */
+  error?: string;
+}
+
+/**
+ * Events emitted by the invitation flow manager.
+ */
+export interface InvitationFlowEvents {
+  'invitation-created': (invitation: XOInvitation) => void;
+  'invitation-updated': (invitationId: string, invitation: XOInvitation) => void;
+  'invitation-state-changed': (invitationId: string, state: InvitationState) => void;
+  'error': (invitationId: string, error: Error) => void;
+}
+
+/**
+ * Manages the invitation workflow.
+ */
+export class InvitationFlowManager extends EventEmitter {
+  /** Map of tracked invitations by ID */
+  private trackedInvitations: Map<string, TrackedInvitation> = new Map();
+  
+  /** Wallet controller reference */
+  private walletController: WalletController;
+  
+  /** Sync client reference */
+  private syncClient: SyncClient;
+
+  /**
+   * Creates a new invitation flow manager.
+   * @param walletController - Wallet controller instance
+   * @param syncClient - Sync client instance
+   */
+  constructor(walletController: WalletController, syncClient: SyncClient) {
+    super();
+    this.walletController = walletController;
+    this.syncClient = syncClient;
+  }
+
+  // ============================================================================
+  // Invitation Tracking
+  // ============================================================================
+
+  /**
+   * Starts tracking an invitation.
+   * @param invitation - Invitation to track
+   * @param initialState - Initial state (default: 'created')
+   */
+  track(invitation: XOInvitation, initialState: InvitationState = 'created'): TrackedInvitation {
+    const tracked: TrackedInvitation = {
+      invitation,
+      state: initialState,
+      trackedAt: Date.now(),
+      lastUpdatedAt: Date.now(),
+    };
+
+    this.trackedInvitations.set(invitation.invitationIdentifier, tracked);
+    return tracked;
+  }
+
+  /**
+   * Gets a tracked invitation by ID.
+   * @param invitationId - Invitation ID
+   * @returns Tracked invitation or undefined
+   */
+  get(invitationId: string): TrackedInvitation | undefined {
+    return this.trackedInvitations.get(invitationId);
+  }
+
+  /**
+   * Gets all tracked invitations.
+   * @returns Array of tracked invitations
+   */
+  getAll(): TrackedInvitation[] {
+    return Array.from(this.trackedInvitations.values());
+  }
+
+  /**
+   * Updates the state of a tracked invitation.
+   * @param invitationId - Invitation ID
+   * @param state - New state
+   */
+  private updateState(invitationId: string, state: InvitationState): void {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (tracked) {
+      tracked.state = state;
+      tracked.lastUpdatedAt = Date.now();
+      this.emit('invitation-state-changed', invitationId, state);
+    }
+  }
+
+  /**
+   * Updates a tracked invitation with new data.
+   * @param invitation - Updated invitation
+   */
+  private updateInvitation(invitation: XOInvitation): void {
+    const tracked = this.trackedInvitations.get(invitation.invitationIdentifier);
+    if (tracked) {
+      tracked.invitation = invitation;
+      tracked.lastUpdatedAt = Date.now();
+      this.emit('invitation-updated', invitation.invitationIdentifier, invitation);
+    }
+  }
+
+  /**
+   * Stops tracking an invitation.
+   * @param invitationId - Invitation ID
+   */
+  untrack(invitationId: string): void {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (tracked?.sseSession) {
+      tracked.sseSession.close();
+    }
+    this.trackedInvitations.delete(invitationId);
+  }
+
+  // ============================================================================
+  // Flow Operations
+  // ============================================================================
+
+  /**
+   * Creates a new invitation and starts tracking it.
+   * @param templateIdentifier - Template ID
+   * @param actionIdentifier - Action ID
+   * @returns Created and tracked invitation
+   */
+  async createInvitation(
+    templateIdentifier: string,
+    actionIdentifier: string,
+  ): Promise<TrackedInvitation> {
+    // Create invitation via wallet controller
+    const invitation = await this.walletController.createInvitation(
+      templateIdentifier,
+      actionIdentifier,
+    );
+
+    // Track the invitation
+    const tracked = this.track(invitation, 'created');
+    this.emit('invitation-created', invitation);
+
+    return tracked;
+  }
+
+  /**
+   * Publishes an invitation to the sync server.
+   * @param invitationId - Invitation ID to publish
+   * @returns Updated tracked invitation
+   */
+  async publishInvitation(invitationId: string): Promise<TrackedInvitation> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    try {
+      // Post to sync server
+      await this.syncClient.postInvitation(tracked.invitation);
+      
+      // Update state
+      this.updateState(invitationId, 'published');
+
+      return tracked;
+    } catch (error) {
+      tracked.state = 'error';
+      tracked.error = error instanceof Error ? error.message : String(error);
+      this.emit('error', invitationId, error instanceof Error ? error : new Error(String(error)));
+      throw error;
+    }
+  }
+
+  /**
+   * Subscribes to SSE updates for an invitation.
+   * @param invitationId - Invitation ID to subscribe to
+   */
+  async subscribeToUpdates(invitationId: string): Promise<void> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    // Close existing SSE session if any
+    if (tracked.sseSession) {
+      tracked.sseSession.close();
+    }
+
+    // Create new SSE session
+    const sseUrl = this.syncClient.getSSEUrl(invitationId);
+
+    tracked.sseSession = await SSESession.from(sseUrl, {
+      method: 'GET',
+      headers: {
+        'Accept': 'text/event-stream',
+      },
+      onMessage: (event) => {
+        this.handleSSEMessage(invitationId, event);
+      },
+      onError: (error) => {
+        console.error(`SSE error for ${invitationId}:`, error);
+        this.emit('error', invitationId, error instanceof Error ? error : new Error(String(error)));
+      },
+      onConnected: () => {
+        console.log(`SSE connected for invitation: ${invitationId}`);
+      },
+      onDisconnected: () => {
+        console.log(`SSE disconnected for invitation: ${invitationId}`);
+      },
+      attemptReconnect: true,
+      persistent: true,
+      retryDelay: 3000,
+    });
+
+    // Update state to pending (waiting for updates)
+    this.updateState(invitationId, 'pending');
+  }
+
+  /**
+   * Handles an SSE message for an invitation.
+   * @param invitationId - Invitation ID
+   * @param event - SSE event
+   */
+  private handleSSEMessage(invitationId: string, event: { data: string; event?: string }): void {
+    try {
+      // Parse the event data
+      const parsed = JSON.parse(event.data) as { topic?: string; data?: unknown };
+      
+      if (event.event === 'invitation-updated' || parsed.topic === 'invitation-updated') {
+        // Decode the invitation data (handles ExtJSON)
+        const invitationData = decodeExtendedJsonObject(parsed.data ?? parsed);
+        const invitation = invitationData as XOInvitation;
+
+        // Update tracked invitation
+        this.updateInvitation(invitation);
+
+        // Check if all requirements are met
+        this.checkInvitationState(invitationId);
+      }
+    } catch (error) {
+      console.error(`Error parsing SSE message for ${invitationId}:`, error);
+    }
+  }
+
+  /**
+   * Checks and updates the state of an invitation based on its data.
+   * @param invitationId - Invitation ID to check
+   */
+  private async checkInvitationState(invitationId: string): Promise<void> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) return;
+
+    try {
+      // Check missing requirements
+      const missing = await this.walletController.getMissingRequirements(tracked.invitation);
+      
+      // If no missing inputs/outputs, it's ready to sign
+      const hasNoMissingInputs = !missing.inputs || missing.inputs.length === 0;
+      const hasNoMissingOutputs = !missing.outputs || missing.outputs.length === 0;
+      
+      if (hasNoMissingInputs && hasNoMissingOutputs) {
+        this.updateState(invitationId, 'ready');
+      }
+    } catch (error) {
+      // Ignore errors during state check
+      console.error(`Error checking invitation state: ${error}`);
+    }
+  }
+
+  /**
+   * Imports an invitation from the sync server.
+   * @param invitationId - Invitation ID to import
+   * @returns Tracked invitation
+   */
+  async importInvitation(invitationId: string): Promise<TrackedInvitation> {
+    // Fetch from sync server
+    const invitation = await this.syncClient.getInvitation(invitationId);
+    if (!invitation) {
+      throw new Error(`Invitation not found on server: ${invitationId}`);
+    }
+
+    // Track the invitation
+    const tracked = this.track(invitation, 'pending');
+
+    return tracked;
+  }
+
+  /**
+   * Accepts an invitation (joins as a participant).
+   * @param invitationId - Invitation ID to accept
+   * @returns Updated tracked invitation
+   */
+  async acceptInvitation(invitationId: string): Promise<TrackedInvitation> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    // Accept via wallet controller
+    const updatedInvitation = await this.walletController.acceptInvitation(tracked.invitation);
+    this.updateInvitation(updatedInvitation);
+
+    return tracked;
+  }
+
+  /**
+   * Appends data to an invitation.
+   * @param invitationId - Invitation ID
+   * @param params - Data to append
+   * @returns Updated tracked invitation
+   */
+  async appendToInvitation(
+    invitationId: string,
+    params: Parameters<WalletController['appendInvitation']>[1],
+  ): Promise<TrackedInvitation> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    // Append via wallet controller
+    const updatedInvitation = await this.walletController.appendInvitation(
+      tracked.invitation,
+      params,
+    );
+    this.updateInvitation(updatedInvitation);
+
+    // Publish update to sync server
+    await this.syncClient.updateInvitation(updatedInvitation);
+
+    return tracked;
+  }
+
+  /**
+   * Signs an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Updated tracked invitation
+   */
+  async signInvitation(invitationId: string): Promise<TrackedInvitation> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    // Sign via wallet controller
+    const signedInvitation = await this.walletController.signInvitation(tracked.invitation);
+    this.updateInvitation(signedInvitation);
+    this.updateState(invitationId, 'signed');
+
+    // Publish signed invitation to sync server
+    await this.syncClient.updateInvitation(signedInvitation);
+
+    return tracked;
+  }
+
+  /**
+   * Broadcasts the transaction for an invitation.
+   * @param invitationId - Invitation ID
+   * @returns Transaction hash
+   */
+  async broadcastTransaction(invitationId: string): Promise<string> {
+    const tracked = this.trackedInvitations.get(invitationId);
+    if (!tracked) {
+      throw new Error(`Invitation not found: ${invitationId}`);
+    }
+
+    // Execute action (broadcast)
+    const txHash = await this.walletController.executeAction(tracked.invitation, {
+      broadcastTransaction: true,
+    });
+
+    this.updateState(invitationId, 'broadcast');
+
+    // Close SSE session since we're done
+    if (tracked.sseSession) {
+      tracked.sseSession.close();
+      delete tracked.sseSession;
+    }
+
+    return txHash;
+  }
+
+  /**
+   * Cleans up all resources.
+   */
+  destroy(): void {
+    // Close all SSE sessions
+    for (const tracked of this.trackedInvitations.values()) {
+      if (tracked.sseSession) {
+        tracked.sseSession.close();
+      }
+    }
+    this.trackedInvitations.clear();
+  }
+}

src/services/sync-client.ts

@@ -0,0 +1,162 @@
+/**
+ * Sync Server Client - HTTP client for sync-server communication.
+ * 
+ * Handles:
+ * - Creating/updating invitations on the server
+ * - Fetching invitations by ID
+ * - ExtJSON encoding/decoding for data transfer
+ */
+
+import type { XOInvitation } from '@xo-cash/types';
+import { encodeExtendedJson, decodeExtendedJson } from '../utils/ext-json.js';
+
+/**
+ * Response from the sync server.
+ */
+export interface SyncServerResponse<T> {
+  success: boolean;
+  data?: T;
+  error?: string;
+}
+
+/**
+ * HTTP client for sync-server communication.
+ */
+export class SyncClient {
+  /** Base URL of the sync server */
+  private baseUrl: string;
+
+  /**
+   * Creates a new sync client.
+   * @param baseUrl - Base URL of the sync server (e.g., http://localhost:3000)
+   */
+  constructor(baseUrl: string) {
+    // Remove trailing slash if present
+    this.baseUrl = baseUrl.replace(/\/$/, '');
+  }
+
+  /**
+   * Makes an HTTP request to the sync server.
+   * @param method - HTTP method
+   * @param path - Request path
+   * @param body - Optional request body
+   * @returns Response data
+   */
+  private async request<T>(
+    method: 'GET' | 'POST' | 'PUT' | 'DELETE',
+    path: string,
+    body?: unknown,
+  ): Promise<T> {
+    const url = `${this.baseUrl}${path}`;
+    
+    const headers: Record<string, string> = {
+      'Content-Type': 'application/json',
+      'Accept': 'application/json',
+    };
+
+    const options: RequestInit = {
+      method,
+      headers,
+    };
+
+    if (body !== undefined) {
+      // Encode body using ExtJSON for proper BigInt and Uint8Array serialization
+      options.body = encodeExtendedJson(body);
+    }
+
+    const response = await fetch(url, options);
+
+    if (!response.ok) {
+      const errorText = await response.text();
+      throw new Error(`HTTP ${response.status}: ${errorText}`);
+    }
+
+    const responseText = await response.text();
+    
+    // Return empty object if no response body
+    if (!responseText) {
+      return {} as T;
+    }
+
+    // Decode response using ExtJSON
+    return decodeExtendedJson(responseText) as T;
+  }
+
+  // ============================================================================
+  // Invitation Operations
+  // ============================================================================
+
+  /**
+   * Posts an invitation to the sync server (create or update).
+   * @param invitation - Invitation to post
+   * @returns The stored invitation
+   */
+  async postInvitation(invitation: XOInvitation): Promise<XOInvitation> {
+    return this.request<XOInvitation>('POST', '/invitations', invitation);
+  }
+
+  /**
+   * Gets an invitation from the sync server.
+   * @param invitationIdentifier - Invitation ID to fetch
+   * @returns The invitation or undefined if not found
+   */
+  async getInvitation(invitationIdentifier: string): Promise<XOInvitation | undefined> {
+    try {
+      // Use query parameter for GET request (can't have body)
+      const response = await this.request<XOInvitation>(
+        'GET', 
+        `/invitations?invitationIdentifier=${encodeURIComponent(invitationIdentifier)}`
+      );
+      return response;
+    } catch (error) {
+      // Return undefined if not found (404)
+      if (error instanceof Error && error.message.includes('404')) {
+        return undefined;
+      }
+      throw error;
+    }
+  }
+
+  /**
+   * Updates an invitation on the sync server.
+   * @param invitation - Updated invitation
+   * @returns The updated invitation
+   */
+  async updateInvitation(invitation: XOInvitation): Promise<XOInvitation> {
+    // Uses the same POST endpoint which handles both create and update
+    return this.postInvitation(invitation);
+  }
+
+  // ============================================================================
+  // Health Check
+  // ============================================================================
+
+  /**
+   * Checks if the sync server is healthy.
+   * @returns True if server is healthy
+   */
+  async isHealthy(): Promise<boolean> {
+    try {
+      const response = await this.request<{ status: string }>('GET', '/health');
+      return response.status === 'ok';
+    } catch {
+      return false;
+    }
+  }
+
+  /**
+   * Gets the base URL of the sync server.
+   */
+  getBaseUrl(): string {
+    return this.baseUrl;
+  }
+
+  /**
+   * Gets the SSE endpoint URL for an invitation.
+   * @param invitationId - Invitation ID to subscribe to
+   * @returns SSE endpoint URL
+   */
+  getSSEUrl(invitationIdentifier: string): string {
+    return `${this.baseUrl}/invitations?invitationIdentifier=${encodeURIComponent(invitationIdentifier)}`;
+  }
+}

src/tui/App.tsx

@@ -0,0 +1,204 @@
+/**
+ * Main App component for the XO Wallet CLI.
+ * Uses Ink for terminal rendering with React components.
+ */
+
+import React from 'react';
+import { Box, Text, useApp, useInput } from 'ink';
+import { NavigationProvider, useNavigation } from './hooks/useNavigation.js';
+import { AppProvider, useAppContext, useDialog, useStatus } from './hooks/useAppContext.js';
+import type { WalletController } from '../controllers/wallet-controller.js';
+import type { InvitationController } from '../controllers/invitation-controller.js';
+import { colors, logoSmall } from './theme.js';
+
+// Screen imports (will be created)
+import { SeedInputScreen } from './screens/SeedInput.js';
+import { WalletStateScreen } from './screens/WalletState.js';
+import { TemplateListScreen } from './screens/TemplateList.js';
+import { ActionWizardScreen } from './screens/ActionWizard.js';
+import { InvitationScreen } from './screens/Invitation.js';
+import { TransactionScreen } from './screens/Transaction.js';
+
+/**
+ * Props for the App component.
+ */
+interface AppProps {
+  walletController: WalletController;
+  invitationController: InvitationController;
+}
+
+/**
+ * Router component that renders the current screen.
+ */
+function Router(): React.ReactElement {
+  const { screen } = useNavigation();
+
+  switch (screen) {
+    case 'seed-input':
+      return <SeedInputScreen />;
+    case 'wallet':
+      return <WalletStateScreen />;
+    case 'templates':
+      return <TemplateListScreen />;
+    case 'wizard':
+      return <ActionWizardScreen />;
+    case 'invitations':
+      return <InvitationScreen />;
+    case 'transaction':
+      return <TransactionScreen />;
+    default:
+      return <Text color={colors.error}>Unknown screen: {screen}</Text>;
+  }
+}
+
+/**
+ * Status bar component shown at the bottom of the screen.
+ */
+function StatusBar(): React.ReactElement {
+  const { status } = useStatus();
+  const { screen, canGoBack } = useNavigation();
+
+  return (
+    <Box 
+      borderStyle="single" 
+      borderColor={colors.border}
+      paddingX={1}
+      justifyContent="space-between"
+    >
+      <Text color={colors.primary} bold>{logoSmall}</Text>
+      <Text color={colors.textMuted}>{status}</Text>
+      <Text color={colors.textMuted}>
+        {canGoBack ? 'ESC: Back | ' : ''}q: Quit
+      </Text>
+    </Box>
+  );
+}
+
+/**
+ * Dialog overlay component for modals.
+ */
+function DialogOverlay(): React.ReactElement | null {
+  const { dialog, setDialog } = useDialog();
+
+  useInput((input, key) => {
+    if (!dialog?.visible) return;
+
+    if (key.return || input === 'y' || input === 'Y') {
+      if (dialog.type === 'confirm' && dialog.onConfirm) {
+        dialog.onConfirm();
+      } else {
+        dialog.onCancel?.();
+      }
+    } else if (key.escape || input === 'n' || input === 'N') {
+      dialog.onCancel?.();
+    }
+  }, { isActive: dialog?.visible ?? false });
+
+  if (!dialog?.visible) return null;
+
+  const borderColor = dialog.type === 'error' ? colors.error : 
+                      dialog.type === 'confirm' ? colors.warning : 
+                      colors.info;
+
+  return (
+    <Box
+      position="absolute"
+      flexDirection="column"
+      alignItems="center"
+      justifyContent="center"
+      width="100%"
+      height="100%"
+    >
+      <Box
+        flexDirection="column"
+        borderStyle="double"
+        borderColor={borderColor}
+        paddingX={2}
+        paddingY={1}
+        width={60}
+      >
+        <Text color={borderColor} bold>
+          {dialog.type === 'error' ? '✗ Error' : 
+           dialog.type === 'confirm' ? '? Confirm' : 
+           'ℹ Info'}
+        </Text>
+        <Box marginY={1}>
+          <Text wrap="wrap">{dialog.message}</Text>
+        </Box>
+        <Text color={colors.textMuted}>
+          {dialog.type === 'confirm' 
+            ? 'Press Y to confirm, N or ESC to cancel'
+            : 'Press Enter or ESC to close'}
+        </Text>
+      </Box>
+    </Box>
+  );
+}
+
+/**
+ * Main content wrapper with global keybindings.
+ */
+function MainContent(): React.ReactElement {
+  const { exit } = useApp();
+  const { goBack, canGoBack } = useNavigation();
+  const { dialog } = useDialog();
+  const appContext = useAppContext();
+
+  // Global keybindings (disabled when dialog is shown)
+  useInput((input, key) => {
+    // Don't handle global keys when dialog is shown
+    if (dialog?.visible) return;
+
+    // Quit on 'q' or Ctrl+C
+    if (input === 'q' || (key.ctrl && input === 'c')) {
+      appContext.exit();
+      exit();
+    }
+
+    // Go back on Escape
+    if (key.escape && canGoBack) {
+      goBack();
+    }
+  });
+
+  return (
+    <Box flexDirection="column" height="100%">
+      {/* Main content area */}
+      <Box flexDirection="column" flexGrow={1}>
+        <Router />
+      </Box>
+      
+      {/* Status bar */}
+      <StatusBar />
+      
+      {/* Dialog overlay */}
+      <DialogOverlay />
+    </Box>
+  );
+}
+
+/**
+ * Main App component.
+ * Sets up providers and renders the main content.
+ */
+export function App({ walletController, invitationController }: AppProps): React.ReactElement {
+  const { exit } = useApp();
+
+  const handleExit = () => {
+    // Cleanup controllers if needed
+    walletController.stop();
+    exit();
+  };
+
+  return (
+    <AppProvider
+      walletController={walletController}
+      invitationController={invitationController}
+      onExit={handleExit}
+    >
+      <NavigationProvider initialScreen="seed-input">
+        <MainContent />
+      </NavigationProvider>
+    </AppProvider>
+  );
+}

src/tui/components/Button.tsx

@@ -0,0 +1,75 @@
+/**
+ * Button component with focus styling.
+ */
+
+import React from 'react';
+import { Box, Text, useFocus } from 'ink';
+import { colors } from '../theme.js';
+
+/**
+ * Props for the Button component.
+ */
+interface ButtonProps {
+  /** Button label */
+  label: string;
+  /** Whether button is focused */
+  focused?: boolean;
+  /** Whether button is disabled */
+  disabled?: boolean;
+  /** Optional keyboard shortcut hint */
+  shortcut?: string;
+}
+
+/**
+ * Button component with focus highlighting.
+ */
+export function Button({
+  label,
+  focused = false,
+  disabled = false,
+  shortcut,
+}: ButtonProps): React.ReactElement {
+  const bgColor = disabled 
+    ? colors.textMuted 
+    : focused 
+      ? colors.focus 
+      : colors.secondary;
+  
+  const textColor = disabled 
+    ? colors.bg 
+    : focused 
+      ? colors.bg 
+      : colors.text;
+
+  return (
+    <Box>
+      <Box paddingX={1} marginRight={1}>
+        <Text 
+          backgroundColor={bgColor} 
+          color={textColor}
+          bold={focused}
+        >
+          {` ${label} `}
+        </Text>
+      </Box>
+      {shortcut && (
+        <Text color={colors.textMuted} dimColor>({shortcut})</Text>
+      )}
+    </Box>
+  );
+}
+
+/**
+ * Button row component for multiple buttons.
+ */
+interface ButtonRowProps {
+  children: React.ReactNode;
+}
+
+export function ButtonRow({ children }: ButtonRowProps): React.ReactElement {
+  return (
+    <Box marginTop={1} gap={2}>
+      {children}
+    </Box>
+  );
+}

src/tui/components/Dialog.tsx

@@ -0,0 +1,243 @@
+/**
+ * Dialog components for modals, confirmations, and input dialogs.
+ */
+
+import React, { useState } from 'react';
+import { Box, Text, useInput } from 'ink';
+import TextInput from 'ink-text-input';
+import { colors } from '../theme.js';
+
+/**
+ * Base dialog wrapper props.
+ */
+interface DialogWrapperProps {
+  /** Dialog title */
+  title: string;
+  /** Border color */
+  borderColor?: string;
+  /** Dialog content */
+  children: React.ReactNode;
+  /** Dialog width */
+  width?: number;
+}
+
+/**
+ * Base dialog wrapper component.
+ */
+function DialogWrapper({
+  title,
+  borderColor = colors.primary,
+  children,
+  width = 60,
+}: DialogWrapperProps): React.ReactElement {
+  return (
+    <Box
+      flexDirection="column"
+      borderStyle="double"
+      borderColor={borderColor}
+      paddingX={2}
+      paddingY={1}
+      width={width}
+    >
+      <Text color={borderColor} bold>{title}</Text>
+      <Box marginY={1} flexDirection="column">
+        {children}
+      </Box>
+    </Box>
+  );
+}
+
+/**
+ * Props for InputDialog component.
+ */
+interface InputDialogProps {
+  /** Dialog title */
+  title: string;
+  /** Input prompt/label */
+  prompt: string;
+  /** Initial value */
+  initialValue?: string;
+  /** Placeholder text */
+  placeholder?: string;
+  /** Submit handler */
+  onSubmit: (value: string) => void;
+  /** Cancel handler */
+  onCancel: () => void;
+  /** Whether dialog is visible/active */
+  isActive?: boolean;
+}
+
+/**
+ * Input dialog for getting text input from user.
+ */
+export function InputDialog({
+  title,
+  prompt,
+  initialValue = '',
+  placeholder,
+  onSubmit,
+  onCancel,
+  isActive = true,
+}: InputDialogProps): React.ReactElement {
+  const [value, setValue] = useState(initialValue);
+
+  useInput((input, key) => {
+    if (!isActive) return;
+    
+    if (key.escape) {
+      onCancel();
+    }
+  }, { isActive });
+
+  const handleSubmit = (val: string) => {
+    onSubmit(val);
+  };
+
+  return (
+    <DialogWrapper title={title} borderColor={colors.primary}>
+      <Text>{prompt}</Text>
+      <Box marginTop={1} borderStyle="single" borderColor={colors.focus} paddingX={1}>
+        <TextInput
+          value={value}
+          onChange={setValue}
+          onSubmit={handleSubmit}
+          placeholder={placeholder}
+          focus={isActive}
+        />
+      </Box>
+      <Box marginTop={1}>
+        <Text color={colors.textMuted}>Enter to submit • Esc to cancel</Text>
+      </Box>
+    </DialogWrapper>
+  );
+}
+
+/**
+ * Props for ConfirmDialog component.
+ */
+interface ConfirmDialogProps {
+  /** Dialog title */
+  title: string;
+  /** Confirmation message */
+  message: string;
+  /** Confirm handler */
+  onConfirm: () => void;
+  /** Cancel handler */
+  onCancel: () => void;
+  /** Whether dialog is visible/active */
+  isActive?: boolean;
+  /** Confirm button label */
+  confirmLabel?: string;
+  /** Cancel button label */
+  cancelLabel?: string;
+}
+
+/**
+ * Confirmation dialog with Yes/No options.
+ */
+export function ConfirmDialog({
+  title,
+  message,
+  onConfirm,
+  onCancel,
+  isActive = true,
+  confirmLabel = 'Yes',
+  cancelLabel = 'No',
+}: ConfirmDialogProps): React.ReactElement {
+  const [selected, setSelected] = useState<'confirm' | 'cancel'>('confirm');
+
+  useInput((input, key) => {
+    if (!isActive) return;
+
+    if (key.leftArrow || key.rightArrow || key.tab) {
+      setSelected(prev => prev === 'confirm' ? 'cancel' : 'confirm');
+    } else if (key.return) {
+      if (selected === 'confirm') {
+        onConfirm();
+      } else {
+        onCancel();
+      }
+    } else if (key.escape || input === 'n' || input === 'N') {
+      onCancel();
+    } else if (input === 'y' || input === 'Y') {
+      onConfirm();
+    }
+  }, { isActive });
+
+  return (
+    <DialogWrapper title={title} borderColor={colors.warning}>
+      <Text wrap="wrap">{message}</Text>
+      <Box marginTop={1} gap={2}>
+        <Text
+          backgroundColor={selected === 'confirm' ? colors.focus : colors.secondary}
+          color={selected === 'confirm' ? colors.bg : colors.text}
+          bold={selected === 'confirm'}
+        >
+          {` ${confirmLabel} `}
+        </Text>
+        <Text
+          backgroundColor={selected === 'cancel' ? colors.focus : colors.secondary}
+          color={selected === 'cancel' ? colors.bg : colors.text}
+          bold={selected === 'cancel'}
+        >
+          {` ${cancelLabel} `}
+        </Text>
+      </Box>
+      <Box marginTop={1}>
+        <Text color={colors.textMuted}>Y/N or Tab to switch • Enter to select</Text>
+      </Box>
+    </DialogWrapper>
+  );
+}
+
+/**
+ * Props for MessageDialog component.
+ */
+interface MessageDialogProps {
+  /** Dialog title */
+  title: string;
+  /** Message content */
+  message: string;
+  /** Close handler */
+  onClose: () => void;
+  /** Dialog type for styling */
+  type?: 'info' | 'error' | 'success';
+  /** Whether dialog is visible/active */
+  isActive?: boolean;
+}
+
+/**
+ * Simple message dialog (info, error, success).
+ */
+export function MessageDialog({
+  title,
+  message,
+  onClose,
+  type = 'info',
+  isActive = true,
+}: MessageDialogProps): React.ReactElement {
+  useInput((input, key) => {
+    if (!isActive) return;
+    
+    if (key.return || key.escape) {
+      onClose();
+    }
+  }, { isActive });
+
+  const borderColor = type === 'error' ? colors.error :
+                      type === 'success' ? colors.success :
+                      colors.info;
+
+  const icon = type === 'error' ? '✗' :
+               type === 'success' ? '✓' :
+               'ℹ';
+
+  return (
+    <DialogWrapper title={`${icon} ${title}`} borderColor={borderColor}>
+      <Text wrap="wrap">{message}</Text>
+      <Box marginTop={1}>
+        <Text color={colors.textMuted}>Press Enter or Esc to close</Text>
+      </Box>
+    </DialogWrapper>
+  );
+}

src/tui/components/Input.tsx

@@ -0,0 +1,109 @@
+/**
+ * Text input component with focus styling.
+ */
+
+import React from 'react';
+import { Box, Text } from 'ink';
+import TextInput from 'ink-text-input';
+import { colors } from '../theme.js';
+
+/**
+ * Props for the Input component.
+ */
+interface InputProps {
+  /** Current value */
+  value: string;
+  /** Change handler */
+  onChange: (value: string) => void;
+  /** Submit handler (Enter key) */
+  onSubmit?: (value: string) => void;
+  /** Placeholder text */
+  placeholder?: string;
+  /** Label shown above input */
+  label?: string;
+  /** Whether input is focused */
+  focus?: boolean;
+  /** Whether to mask input (for passwords) */
+  mask?: string;
+  /** Whether input is disabled */
+  disabled?: boolean;
+}
+
+/**
+ * Text input component with label and focus styling.
+ */
+export function Input({
+  value,
+  onChange,
+  onSubmit,
+  placeholder,
+  label,
+  focus = true,
+  mask,
+  disabled = false,
+}: InputProps): React.ReactElement {
+  const borderColor = focus ? colors.focus : colors.border;
+
+  return (
+    <Box flexDirection="column">
+      {label && (
+        <Text color={colors.text} bold>{label}</Text>
+      )}
+      <Box
+        borderStyle="single"
+        borderColor={borderColor}
+        paddingX={1}
+      >
+        {disabled ? (
+          <Text color={colors.textMuted}>{value || placeholder || ''}</Text>
+        ) : (
+          <TextInput
+            value={value}
+            onChange={onChange}
+            onSubmit={onSubmit}
+            placeholder={placeholder}
+            focus={focus}
+            mask={mask}
+          />
+        )}
+      </Box>
+    </Box>
+  );
+}
+
+/**
+ * Multi-line text display (read-only, styled like input).
+ */
+interface TextDisplayProps {
+  /** Text content */
+  content: string;
+  /** Label shown above */
+  label?: string;
+  /** Whether to show border */
+  border?: boolean;
+}
+
+export function TextDisplay({ 
+  content, 
+  label, 
+  border = true 
+}: TextDisplayProps): React.ReactElement {
+  return (
+    <Box flexDirection="column">
+      {label && (
+        <Text color={colors.text} bold>{label}</Text>
+      )}
+      {border ? (
+        <Box
+          borderStyle="single"
+          borderColor={colors.border}
+          paddingX={1}
+        >
+          <Text>{content}</Text>
+        </Box>
+      ) : (
+        <Text>{content}</Text>
+      )}
+    </Box>
+  );
+}

src/tui/components/List.tsx

@@ -0,0 +1,159 @@
+/**
+ * Selectable list component with keyboard navigation.
+ */
+
+import React from 'react';
+import { Box, Text, useInput } from 'ink';
+import { colors } from '../theme.js';
+
+/**
+ * List item type.
+ */
+export interface ListItem<T = unknown> {
+  /** Unique key for the item */
+  key: string;
+  /** Display label */
+  label: string;
+  /** Optional secondary text */
+  description?: string;
+  /** Optional value associated with item */
+  value?: T;
+  /** Whether item is disabled */
+  disabled?: boolean;
+}
+
+/**
+ * Props for the List component.
+ */
+interface ListProps<T> {
+  /** List items */
+  items: ListItem<T>[];
+  /** Currently selected index */
+  selectedIndex: number;
+  /** Selection change handler */
+  onSelect: (index: number) => void;
+  /** Item activation handler (Enter key) */
+  onActivate?: (item: ListItem<T>, index: number) => void;
+  /** Whether list is focused */
+  focus?: boolean;
+  /** Maximum visible items (for scrolling) */
+  maxVisible?: number;
+  /** Optional label */
+  label?: string;
+  /** Show border */
+  border?: boolean;
+}
+
+/**
+ * Selectable list with keyboard navigation.
+ */
+export function List<T>({
+  items,
+  selectedIndex,
+  onSelect,
+  onActivate,
+  focus = true,
+  maxVisible = 10,
+  label,
+  border = true,
+}: ListProps<T>): React.ReactElement {
+  // Handle keyboard input
+  useInput((input, key) => {
+    if (!focus) return;
+
+    if (key.upArrow || input === 'k') {
+      const newIndex = selectedIndex > 0 ? selectedIndex - 1 : items.length - 1;
+      onSelect(newIndex);
+    } else if (key.downArrow || input === 'j') {
+      const newIndex = selectedIndex < items.length - 1 ? selectedIndex + 1 : 0;
+      onSelect(newIndex);
+    } else if (key.return && onActivate && items[selectedIndex]) {
+      const item = items[selectedIndex];
+      if (item && !item.disabled) {
+        onActivate(item, selectedIndex);
+      }
+    }
+  }, { isActive: focus });
+
+  // Calculate visible range for scrolling
+  const startIndex = Math.max(0, Math.min(selectedIndex - Math.floor(maxVisible / 2), items.length - maxVisible));
+  const visibleItems = items.slice(startIndex, startIndex + maxVisible);
+
+  const borderColor = focus ? colors.focus : colors.border;
+
+  const content = (
+    <Box flexDirection="column">
+      {visibleItems.map((item, visibleIndex) => {
+        const actualIndex = startIndex + visibleIndex;
+        const isSelected = actualIndex === selectedIndex;
+        
+        return (
+          <Box key={item.key}>
+            <Text
+              color={item.disabled ? colors.textMuted : isSelected ? colors.bg : colors.text}
+              backgroundColor={isSelected ? colors.focus : undefined}
+              bold={isSelected}
+              dimColor={item.disabled}
+            >
+              {isSelected ? '▸ ' : '  '}
+              {item.label}
+            </Text>
+            {item.description && (
+              <Text color={colors.textMuted} dimColor> - {item.description}</Text>
+            )}
+          </Box>
+        );
+      })}
+      {items.length === 0 && (
+        <Text color={colors.textMuted} dimColor>No items</Text>
+      )}
+    </Box>
+  );
+
+  return (
+    <Box flexDirection="column">
+      {label && <Text color={colors.text} bold>{label}</Text>}
+      {border ? (
+        <Box
+          borderStyle="single"
+          borderColor={borderColor}
+          paddingX={1}
+          flexDirection="column"
+        >
+          {content}
+        </Box>
+      ) : content}
+      {items.length > maxVisible && (
+        <Text color={colors.textMuted} dimColor>
+          {startIndex + 1}-{Math.min(startIndex + maxVisible, items.length)} of {items.length}
+        </Text>
+      )}
+    </Box>
+  );
+}
+
+/**
+ * Simple inline list for displaying items without selection.
+ */
+interface SimpleListProps {
+  items: string[];
+  label?: string;
+  bullet?: string;
+}
+
+export function SimpleList({ 
+  items, 
+  label, 
+  bullet = '•' 
+}: SimpleListProps): React.ReactElement {
+  return (
+    <Box flexDirection="column">
+      {label && <Text color={colors.text} bold>{label}</Text>}
+      {items.map((item, index) => (
+        <Text key={index} color={colors.text}>
+          {bullet} {item}
+        </Text>
+      ))}
+    </Box>
+  );
+}

src/tui/components/ProgressBar.tsx

@@ -0,0 +1,130 @@
+/**
+ * Progress bar and step indicator components.
+ */
+
+import React from 'react';
+import { Box, Text } from 'ink';
+import { colors } from '../theme.js';
+
+/**
+ * Props for ProgressBar component.
+ */
+interface ProgressBarProps {
+  /** Current progress (0-100) */
+  percent: number;
+  /** Bar width in characters */
+  width?: number;
+  /** Show percentage text */
+  showPercent?: boolean;
+  /** Bar character */
+  character?: string;
+}
+
+/**
+ * Simple progress bar component.
+ */
+export function ProgressBar({
+  percent,
+  width = 40,
+  showPercent = true,
+  character = '█',
+}: ProgressBarProps): React.ReactElement {
+  const clampedPercent = Math.max(0, Math.min(100, percent));
+  const filled = Math.round((clampedPercent / 100) * width);
+  const empty = width - filled;
+
+  return (
+    <Box>
+      <Text color={colors.success}>{character.repeat(filled)}</Text>
+      <Text color={colors.textMuted} dimColor>{'░'.repeat(empty)}</Text>
+      {showPercent && (
+        <Text color={colors.text}> {Math.round(clampedPercent)}%</Text>
+      )}
+    </Box>
+  );
+}
+
+/**
+ * Step definition for StepIndicator.
+ */
+export interface Step {
+  /** Step label */
+  label: string;
+  /** Whether step is completed */
+  completed?: boolean;
+  /** Whether step is current */
+  current?: boolean;
+}
+
+/**
+ * Props for StepIndicator component.
+ */
+interface StepIndicatorProps {
+  /** Steps to display */
+  steps: Step[];
+  /** Current step index (0-based) */
+  currentStep: number;
+}
+
+/**
+ * Step indicator showing progress through a multi-step wizard.
+ */
+export function StepIndicator({
+  steps,
+  currentStep,
+}: StepIndicatorProps): React.ReactElement {
+  return (
+    <Box flexDirection="column" marginBottom={1}>
+      <Box gap={1}>
+        {steps.map((step, index) => {
+          const isCompleted = index < currentStep;
+          const isCurrent = index === currentStep;
+          
+          const color = isCompleted ? colors.success :
+                       isCurrent ? colors.focus :
+                       colors.textMuted;
+          
+          const icon = isCompleted ? '✓' :
+                       isCurrent ? '▸' :
+                       '○';
+
+          return (
+            <Box key={index}>
+              <Text color={color} bold={isCurrent}>
+                {icon} {step.label}
+              </Text>
+              {index < steps.length - 1 && (
+                <Text color={colors.textMuted}> → </Text>
+              )}
+            </Box>
+          );
+        })}
+      </Box>
+      <Text color={colors.textMuted}>
+        Step {currentStep + 1} of {steps.length}
+      </Text>
+    </Box>
+  );
+}
+
+/**
+ * Loading spinner with optional message.
+ */
+interface LoadingProps {
+  /** Loading message */
+  message?: string;
+}
+
+export function Loading({ message = 'Loading...' }: LoadingProps): React.ReactElement {
+  // Simple spinner using Ink's spinner component
+  const Spinner = require('ink-spinner').default;
+  
+  return (
+    <Box>
+      <Text color={colors.primary}>
+        <Spinner type="dots" />
+      </Text>
+      <Text color={colors.text}> {message}</Text>
+    </Box>
+  );
+}

src/tui/components/Screen.tsx

@@ -0,0 +1,71 @@
+/**
+ * Screen wrapper component providing consistent layout.
+ */
+
+import React, { type ReactNode } from 'react';
+import { Box, Text } from 'ink';
+import { colors } from '../theme.js';
+
+/**
+ * Props for the Screen component.
+ */
+interface ScreenProps {
+  /** Screen title displayed in header */
+  title: string;
+  /** Optional subtitle */
+  subtitle?: string;
+  /** Screen content */
+  children: ReactNode;
+  /** Optional footer content */
+  footer?: ReactNode;
+  /** Optional help text shown at bottom */
+  helpText?: string;
+}
+
+/**
+ * Screen wrapper component.
+ * Provides consistent header, content area, and footer layout.
+ */
+export function Screen({ 
+  title, 
+  subtitle, 
+  children, 
+  footer,
+  helpText 
+}: ScreenProps): React.ReactElement {
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box 
+        borderStyle="single" 
+        borderColor={colors.primary}
+        paddingX={1}
+        marginBottom={1}
+      >
+        <Box flexDirection="column">
+          <Text color={colors.primary} bold>{title}</Text>
+          {subtitle && <Text color={colors.textMuted}>{subtitle}</Text>}
+        </Box>
+      </Box>
+
+      {/* Content */}
+      <Box flexDirection="column" flexGrow={1} paddingX={1}>
+        {children}
+      </Box>
+
+      {/* Help text */}
+      {helpText && (
+        <Box paddingX={1} marginTop={1}>
+          <Text color={colors.textMuted} dimColor>{helpText}</Text>
+        </Box>
+      )}
+
+      {/* Footer */}
+      {footer && (
+        <Box paddingX={1} marginTop={1}>
+          {footer}
+        </Box>
+      )}
+    </Box>
+  );
+}

src/tui/components/index.ts

@@ -0,0 +1,10 @@
+/**
+ * Export all shared components.
+ */
+
+export { Screen } from './Screen.js';
+export { Input, TextDisplay } from './Input.js';
+export { Button, ButtonRow } from './Button.js';
+export { List, SimpleList, type ListItem } from './List.js';
+export { InputDialog, ConfirmDialog, MessageDialog } from './Dialog.js';
+export { ProgressBar, StepIndicator, Loading, type Step } from './ProgressBar.js';

src/tui/hooks/index.ts

@@ -0,0 +1,6 @@
+/**
+ * Export all hooks.
+ */
+
+export { NavigationProvider, useNavigation } from './useNavigation.js';
+export { AppProvider, useAppContext, useDialog, useStatus } from './useAppContext.js';

src/tui/hooks/useAppContext.tsx

@@ -0,0 +1,183 @@
+/**
+ * App context hook for accessing controllers and app-level functions.
+ */
+
+import React, { createContext, useContext, useState, useCallback, type ReactNode } from 'react';
+import type { WalletController } from '../../controllers/wallet-controller.js';
+import type { InvitationController } from '../../controllers/invitation-controller.js';
+import type { AppContextType, DialogState } from '../types.js';
+
+/**
+ * App context.
+ */
+const AppContext = createContext<AppContextType | null>(null);
+
+/**
+ * Dialog context for managing modal dialogs.
+ */
+interface DialogContextType {
+  dialog: DialogState | null;
+  setDialog: (dialog: DialogState | null) => void;
+}
+
+const DialogContext = createContext<DialogContextType | null>(null);
+
+/**
+ * Status context for managing status bar.
+ */
+interface StatusContextType {
+  status: string;
+  setStatus: (status: string) => void;
+}
+
+const StatusContext = createContext<StatusContextType | null>(null);
+
+/**
+ * App provider props.
+ */
+interface AppProviderProps {
+  children: ReactNode;
+  walletController: WalletController;
+  invitationController: InvitationController;
+  onExit: () => void;
+}
+
+/**
+ * App provider component.
+ * Provides controllers, dialog management, and app-level functions to children.
+ */
+export function AppProvider({
+  children,
+  walletController,
+  invitationController,
+  onExit,
+}: AppProviderProps): React.ReactElement {
+  const [dialog, setDialog] = useState<DialogState | null>(null);
+  const [status, setStatusState] = useState<string>('Ready');
+  const [isWalletInitialized, setWalletInitialized] = useState(false);
+
+  // Promise resolver for confirm dialogs
+  const [confirmResolver, setConfirmResolver] = useState<((value: boolean) => void) | null>(null);
+
+  /**
+   * Show an error dialog.
+   */
+  const showError = useCallback((message: string) => {
+    setDialog({
+      visible: true,
+      type: 'error',
+      message,
+      onCancel: () => setDialog(null),
+    });
+  }, []);
+
+  /**
+   * Show an info dialog.
+   */
+  const showInfo = useCallback((message: string) => {
+    setDialog({
+      visible: true,
+      type: 'info',
+      message,
+      onCancel: () => setDialog(null),
+    });
+  }, []);
+
+  /**
+   * Show a confirmation dialog and wait for user response.
+   */
+  const confirm = useCallback((message: string): Promise<boolean> => {
+    return new Promise((resolve) => {
+      setConfirmResolver(() => resolve);
+      setDialog({
+        visible: true,
+        type: 'confirm',
+        message,
+        onConfirm: () => {
+          setDialog(null);
+          resolve(true);
+        },
+        onCancel: () => {
+          setDialog(null);
+          resolve(false);
+        },
+      });
+    });
+  }, []);
+
+  /**
+   * Update status bar message.
+   */
+  const setStatus = useCallback((message: string) => {
+    setStatusState(message);
+  }, []);
+
+  const appValue: AppContextType = {
+    walletController,
+    invitationController,
+    showError,
+    showInfo,
+    confirm,
+    exit: onExit,
+    setStatus,
+    isWalletInitialized,
+    setWalletInitialized,
+  };
+
+  const dialogValue: DialogContextType = {
+    dialog,
+    setDialog,
+  };
+
+  const statusValue: StatusContextType = {
+    status,
+    setStatus,
+  };
+
+  return (
+    <AppContext.Provider value={appValue}>
+      <DialogContext.Provider value={dialogValue}>
+        <StatusContext.Provider value={statusValue}>
+          {children}
+        </StatusContext.Provider>
+      </DialogContext.Provider>
+    </AppContext.Provider>
+  );
+}
+
+/**
+ * Hook to access app context.
+ * @returns App context
+ * @throws Error if used outside AppProvider
+ */
+export function useAppContext(): AppContextType {
+  const context = useContext(AppContext);
+  if (!context) {
+    throw new Error('useAppContext must be used within an AppProvider');
+  }
+  return context;
+}
+
+/**
+ * Hook to access dialog context.
+ * @returns Dialog context
+ */
+export function useDialog(): DialogContextType {
+  const context = useContext(DialogContext);
+  if (!context) {
+    throw new Error('useDialog must be used within an AppProvider');
+  }
+  return context;
+}
+
+/**
+ * Hook to access status context.
+ * @returns Status context
+ */
+export function useStatus(): StatusContextType {
+  const context = useContext(StatusContext);
+  if (!context) {
+    throw new Error('useStatus must be used within an AppProvider');
+  }
+  return context;
+}

src/tui/hooks/useNavigation.tsx

@@ -0,0 +1,87 @@
+/**
+ * Navigation hook for managing screen navigation with history.
+ */
+
+import React, { createContext, useContext, useState, useCallback, type ReactNode } from 'react';
+import type { ScreenName, NavigationData, NavigationContextType } from '../types.js';
+
+/**
+ * Navigation context.
+ */
+const NavigationContext = createContext<NavigationContextType | null>(null);
+
+/**
+ * Navigation provider props.
+ */
+interface NavigationProviderProps {
+  children: ReactNode;
+  initialScreen?: ScreenName;
+}
+
+/**
+ * Navigation provider component.
+ * Manages navigation state and provides navigation functions to children.
+ */
+export function NavigationProvider({ 
+  children, 
+  initialScreen = 'seed-input' 
+}: NavigationProviderProps): React.ReactElement {
+  const [screen, setScreen] = useState<ScreenName>(initialScreen);
+  const [data, setData] = useState<NavigationData>({});
+  const [history, setHistory] = useState<ScreenName[]>([]);
+
+  /**
+   * Navigate to a new screen, optionally with data.
+   */
+  const navigate = useCallback((newScreen: ScreenName, newData?: NavigationData) => {
+    // Add current screen to history
+    setHistory(prev => [...prev, screen]);
+    // Set new screen and data
+    setScreen(newScreen);
+    setData(newData ?? {});
+  }, [screen]);
+
+  /**
+   * Go back to the previous screen.
+   */
+  const goBack = useCallback(() => {
+    if (history.length === 0) return;
+    
+    const newHistory = [...history];
+    const previousScreen = newHistory.pop();
+    
+    if (previousScreen) {
+      setHistory(newHistory);
+      setScreen(previousScreen);
+      setData({});
+    }
+  }, [history]);
+
+  const value: NavigationContextType = {
+    screen,
+    data,
+    history,
+    navigate,
+    goBack,
+    canGoBack: history.length > 0,
+  };
+
+  return (
+    <NavigationContext.Provider value={value}>
+      {children}
+    </NavigationContext.Provider>
+  );
+}
+
+/**
+ * Hook to access navigation context.
+ * @returns Navigation context
+ * @throws Error if used outside NavigationProvider
+ */
+export function useNavigation(): NavigationContextType {
+  const context = useContext(NavigationContext);
+  if (!context) {
+    throw new Error('useNavigation must be used within a NavigationProvider');
+  }
+  return context;
+}

src/tui/screens/ActionWizard.tsx

@@ -0,0 +1,497 @@
+/**
+ * Action Wizard Screen - Step-by-step walkthrough for template actions.
+ * 
+ * Guides users through:
+ * - Reviewing action requirements
+ * - Entering variables (e.g., requestedSatoshis)
+ * - Reviewing outputs
+ * - Creating and publishing invitation
+ */
+
+import React, { useState, useEffect, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import TextInput from 'ink-text-input';
+import { StepIndicator, type Step } from '../components/ProgressBar.js';
+import { Button, ButtonRow } from '../components/Button.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, logoSmall, formatSatoshis } from '../theme.js';
+import { copyToClipboard } from '../utils/clipboard.js';
+import type { XOTemplate } from '@xo-cash/types';
+
+/**
+ * Wizard step types.
+ */
+type StepType = 'info' | 'variables' | 'review' | 'publish';
+
+/**
+ * Wizard step definition.
+ */
+interface WizardStep {
+  name: string;
+  type: StepType;
+}
+
+/**
+ * Variable input state.
+ */
+interface VariableInput {
+  id: string;
+  name: string;
+  type: string;
+  hint?: string;
+  value: string;
+}
+
+/**
+ * Action Wizard Screen Component.
+ */
+export function ActionWizardScreen(): React.ReactElement {
+  const { navigate, goBack, data: navData } = useNavigation();
+  const { walletController, invitationController, showError, showInfo } = useAppContext();
+  const { setStatus } = useStatus();
+
+  // Extract navigation data
+  const templateIdentifier = navData.templateIdentifier as string | undefined;
+  const actionIdentifier = navData.actionIdentifier as string | undefined;
+  const roleIdentifier = navData.roleIdentifier as string | undefined;
+  const template = navData.template as XOTemplate | undefined;
+
+  // State
+  const [steps, setSteps] = useState<WizardStep[]>([]);
+  const [currentStep, setCurrentStep] = useState(0);
+  const [variables, setVariables] = useState<VariableInput[]>([]);
+  const [focusedInput, setFocusedInput] = useState(0);
+  const [focusedButton, setFocusedButton] = useState<'back' | 'cancel' | 'next'>('next');
+  const [focusArea, setFocusArea] = useState<'content' | 'buttons'>('content');
+  const [invitationId, setInvitationId] = useState<string | null>(null);
+  const [isCreating, setIsCreating] = useState(false);
+
+  /**
+   * Initialize wizard on mount.
+   */
+  useEffect(() => {
+    if (!template || !actionIdentifier || !roleIdentifier) {
+      showError('Missing wizard data');
+      goBack();
+      return;
+    }
+
+    // Build steps based on template
+    const action = template.actions?.[actionIdentifier];
+    const role = action?.roles?.[roleIdentifier];
+    const requirements = role?.requirements;
+
+    const wizardSteps: WizardStep[] = [
+      { name: 'Welcome', type: 'info' },
+    ];
+
+    // Add variables step if needed
+    if (requirements?.variables && requirements.variables.length > 0) {
+      wizardSteps.push({ name: 'Variables', type: 'variables' });
+
+      // Initialize variable inputs
+      const varInputs = requirements.variables.map(varId => {
+        const varDef = template.variables?.[varId];
+        return {
+          id: varId,
+          name: varDef?.name || varId,
+          type: varDef?.type || 'string',
+          hint: varDef?.hint,
+          value: '',
+        };
+      });
+      setVariables(varInputs);
+    }
+
+    wizardSteps.push({ name: 'Review', type: 'review' });
+    wizardSteps.push({ name: 'Publish', type: 'publish' });
+
+    setSteps(wizardSteps);
+    setStatus(`${actionIdentifier}/${roleIdentifier}`);
+  }, [template, actionIdentifier, roleIdentifier, showError, goBack, setStatus]);
+
+  /**
+   * Get current step data.
+   */
+  const currentStepData = steps[currentStep];
+
+  /**
+   * Navigate to next step.
+   */
+  const nextStep = useCallback(async () => {
+    if (currentStep >= steps.length - 1) return;
+
+    // If on review step, create invitation
+    if (currentStepData?.type === 'review') {
+      await createInvitation();
+      return;
+    }
+
+    setCurrentStep(prev => prev + 1);
+    setFocusArea('content');
+    setFocusedInput(0);
+  }, [currentStep, steps.length, currentStepData]);
+
+  /**
+   * Navigate to previous step.
+   */
+  const previousStep = useCallback(() => {
+    if (currentStep <= 0) {
+      goBack();
+      return;
+    }
+    setCurrentStep(prev => prev - 1);
+    setFocusArea('content');
+    setFocusedInput(0);
+  }, [currentStep, goBack]);
+
+  /**
+   * Cancel wizard.
+   */
+  const cancel = useCallback(() => {
+    goBack();
+  }, [goBack]);
+
+  /**
+   * Create invitation.
+   */
+  const createInvitation = useCallback(async () => {
+    if (!templateIdentifier || !actionIdentifier || !roleIdentifier) return;
+
+    setIsCreating(true);
+    setStatus('Creating invitation...');
+
+    try {
+      // Create invitation
+      const tracked = await invitationController.createInvitation(
+        templateIdentifier,
+        actionIdentifier,
+      );
+
+      const invId = tracked.invitation.invitationIdentifier;
+      setInvitationId(invId);
+
+      // Add variables if any
+      if (variables.length > 0) {
+        const variableData = variables.map(v => ({
+          variableIdentifier: v.id,
+          value: v.type === 'number' || v.type === 'satoshis' 
+            ? BigInt(v.value || '0') 
+            : v.value,
+        }));
+        await invitationController.addVariables(invId, variableData);
+      }
+
+      // Publish to sync server
+      await invitationController.publishAndSubscribe(invId);
+
+      setCurrentStep(prev => prev + 1);
+      setStatus('Invitation created');
+    } catch (error) {
+      showError(`Failed to create invitation: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsCreating(false);
+    }
+  }, [templateIdentifier, actionIdentifier, roleIdentifier, variables, invitationController, showError, setStatus]);
+
+  /**
+   * Copy invitation ID to clipboard.
+   */
+  const copyId = useCallback(async () => {
+    if (!invitationId) return;
+
+    try {
+      await copyToClipboard(invitationId);
+      showInfo(`Copied to clipboard!\n\n${invitationId}`);
+    } catch (error) {
+      showError(`Failed to copy: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }, [invitationId, showInfo, showError]);
+
+  /**
+   * Update variable value.
+   */
+  const updateVariable = useCallback((index: number, value: string) => {
+    setVariables(prev => {
+      const updated = [...prev];
+      const variable = updated[index];
+      if (variable) {
+        updated[index] = { ...variable, value };
+      }
+      return updated;
+    });
+  }, []);
+
+  // Handle keyboard navigation
+  useInput((input, key) => {
+    // Tab to switch between content and buttons
+    if (key.tab) {
+      if (focusArea === 'content') {
+        // In variables step, tab cycles through inputs first
+        if (currentStepData?.type === 'variables' && variables.length > 0) {
+          if (focusedInput < variables.length - 1) {
+            setFocusedInput(prev => prev + 1);
+            return;
+          }
+        }
+        setFocusArea('buttons');
+        setFocusedButton('next');
+      } else {
+        // Cycle through buttons
+        if (focusedButton === 'back') {
+          setFocusedButton('cancel');
+        } else if (focusedButton === 'cancel') {
+          setFocusedButton('next');
+        } else {
+          setFocusArea('content');
+          setFocusedInput(0);
+        }
+      }
+      return;
+    }
+
+    // Shift+Tab
+    if (key.shift && key.tab) {
+      if (focusArea === 'buttons') {
+        if (focusedButton === 'next') {
+          setFocusedButton('cancel');
+        } else if (focusedButton === 'cancel') {
+          setFocusedButton('back');
+        } else {
+          setFocusArea('content');
+          if (currentStepData?.type === 'variables' && variables.length > 0) {
+            setFocusedInput(variables.length - 1);
+          }
+        }
+      } else {
+        if (focusedInput > 0) {
+          setFocusedInput(prev => prev - 1);
+        } else {
+          setFocusArea('buttons');
+          setFocusedButton('back');
+        }
+      }
+      return;
+    }
+
+    // Arrow keys in buttons area
+    if (focusArea === 'buttons') {
+      if (key.leftArrow) {
+        setFocusedButton(prev => 
+          prev === 'next' ? 'cancel' : prev === 'cancel' ? 'back' : 'back'
+        );
+      } else if (key.rightArrow) {
+        setFocusedButton(prev => 
+          prev === 'back' ? 'cancel' : prev === 'cancel' ? 'next' : 'next'
+        );
+      }
+    }
+
+    // Enter on buttons
+    if (key.return && focusArea === 'buttons') {
+      if (focusedButton === 'back') previousStep();
+      else if (focusedButton === 'cancel') cancel();
+      else if (focusedButton === 'next') nextStep();
+    }
+
+    // 'c' to copy on publish step
+    if (input === 'c' && currentStepData?.type === 'publish' && invitationId) {
+      copyId();
+    }
+  });
+
+  // Get action details
+  const action = template?.actions?.[actionIdentifier ?? ''];
+  const actionName = action?.name || actionIdentifier || 'Unknown';
+
+  // Render step content
+  const renderStepContent = () => {
+    if (!currentStepData) return null;
+
+    switch (currentStepData.type) {
+      case 'info':
+        return (
+          <Box flexDirection="column">
+            <Text color={colors.primary} bold>Action: {actionName}</Text>
+            <Text color={colors.textMuted}>{action?.description || 'No description'}</Text>
+            <Box marginTop={1}>
+              <Text color={colors.text}>Your Role: </Text>
+              <Text color={colors.accent}>{roleIdentifier}</Text>
+            </Box>
+            
+            {/* Show requirements */}
+            {action?.roles?.[roleIdentifier ?? '']?.requirements && (
+              <Box marginTop={1} flexDirection="column">
+                <Text color={colors.text}>Requirements:</Text>
+                {action.roles[roleIdentifier ?? '']?.requirements?.variables?.map(v => (
+                  <Text key={v} color={colors.textMuted}>  • Variable: {v}</Text>
+                ))}
+              </Box>
+            )}
+          </Box>
+        );
+
+      case 'variables':
+        return (
+          <Box flexDirection="column">
+            <Text color={colors.text} bold>Enter required values:</Text>
+            <Box marginTop={1} flexDirection="column">
+              {variables.map((variable, index) => (
+                <Box key={variable.id} flexDirection="column" marginBottom={1}>
+                  <Text color={colors.primary}>{variable.name}</Text>
+                  {variable.hint && (
+                    <Text color={colors.textMuted} dimColor>({variable.hint})</Text>
+                  )}
+                  <Box
+                    borderStyle="single"
+                    borderColor={focusArea === 'content' && focusedInput === index ? colors.focus : colors.border}
+                    paddingX={1}
+                    marginTop={1}
+                  >
+                    <TextInput
+                      value={variable.value}
+                      onChange={value => updateVariable(index, value)}
+                      focus={focusArea === 'content' && focusedInput === index}
+                      placeholder={`Enter ${variable.name}...`}
+                    />
+                  </Box>
+                </Box>
+              ))}
+            </Box>
+          </Box>
+        );
+
+      case 'review':
+        return (
+          <Box flexDirection="column">
+            <Text color={colors.text} bold>Review your invitation:</Text>
+            <Box marginTop={1} flexDirection="column">
+              <Text color={colors.textMuted}>Template: {template?.name}</Text>
+              <Text color={colors.textMuted}>Action: {actionName}</Text>
+              <Text color={colors.textMuted}>Role: {roleIdentifier}</Text>
+              
+              {variables.length > 0 && (
+                <Box marginTop={1} flexDirection="column">
+                  <Text color={colors.text}>Variables:</Text>
+                  {variables.map(v => (
+                    <Text key={v.id} color={colors.textMuted}>
+                      {'  '}{v.name}: {v.value || '(empty)'}
+                    </Text>
+                  ))}
+                </Box>
+              )}
+            </Box>
+            
+            <Box marginTop={1}>
+              <Text color={colors.warning}>
+                Press Next to create and publish the invitation.
+              </Text>
+            </Box>
+          </Box>
+        );
+
+      case 'publish':
+        return (
+          <Box flexDirection="column">
+            <Text color={colors.success} bold>✓ Invitation Created!</Text>
+            <Box marginTop={1} flexDirection="column">
+              <Text color={colors.text}>Invitation ID:</Text>
+              <Box 
+                borderStyle="single" 
+                borderColor={colors.primary}
+                paddingX={1}
+                marginTop={1}
+              >
+                <Text color={colors.accent}>{invitationId}</Text>
+              </Box>
+            </Box>
+            
+            <Box marginTop={1}>
+              <Text color={colors.textMuted}>
+                Share this ID with the other party to complete the transaction.
+              </Text>
+            </Box>
+            
+            <Box marginTop={1}>
+              <Text color={colors.warning}>Press 'c' to copy ID to clipboard</Text>
+            </Box>
+          </Box>
+        );
+
+      default:
+        return null;
+    }
+  };
+
+  // Convert steps to StepIndicator format
+  const stepIndicatorSteps: Step[] = steps.map(s => ({ label: s.name }));
+
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box borderStyle="single" borderColor={colors.secondary} paddingX={1} flexDirection="column">
+        <Text color={colors.primary} bold>{logoSmall} - Action Wizard</Text>
+        <Text color={colors.textMuted}>
+          {template?.name} {'>'} {actionName} (as {roleIdentifier})
+        </Text>
+      </Box>
+
+      {/* Progress indicator */}
+      <Box marginTop={1} paddingX={1}>
+        <StepIndicator steps={stepIndicatorSteps} currentStep={currentStep} />
+      </Box>
+
+      {/* Content area */}
+      <Box
+        borderStyle="single"
+        borderColor={focusArea === 'content' ? colors.focus : colors.primary}
+        flexDirection="column"
+        paddingX={1}
+        paddingY={1}
+        marginTop={1}
+        marginX={1}
+        flexGrow={1}
+      >
+        <Text color={colors.primary} bold>
+          {' '}{currentStepData?.name} ({currentStep + 1}/{steps.length}){' '}
+        </Text>
+        <Box marginTop={1}>
+          {isCreating ? (
+            <Text color={colors.info}>Creating invitation...</Text>
+          ) : (
+            renderStepContent()
+          )}
+        </Box>
+      </Box>
+
+      {/* Buttons */}
+      <Box marginTop={1} marginX={1} justifyContent="space-between">
+        <Box gap={1}>
+          <Button 
+            label="Back" 
+            focused={focusArea === 'buttons' && focusedButton === 'back'}
+            disabled={currentStepData?.type === 'publish'}
+          />
+          <Button 
+            label="Cancel" 
+            focused={focusArea === 'buttons' && focusedButton === 'cancel'}
+          />
+        </Box>
+        <Button 
+          label={currentStepData?.type === 'publish' ? 'Done' : 'Next'}
+          focused={focusArea === 'buttons' && focusedButton === 'next'}
+          disabled={isCreating}
+        />
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={1} marginX={1}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: Navigate • Enter: Select • Esc: Back
+          {currentStepData?.type === 'publish' ? ' • c: Copy ID' : ''}
+        </Text>
+      </Box>
+    </Box>
+  );
+}

src/tui/screens/Invitation.tsx

@@ -0,0 +1,407 @@
+/**
+ * Invitation Screen - Manages invitations (create, import, view, monitor).
+ * 
+ * Provides:
+ * - Import invitation by ID
+ * - View active invitations
+ * - Monitor invitation updates via SSE
+ * - Fill missing requirements
+ * - Sign and complete invitations
+ */
+
+import React, { useState, useEffect, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import TextInput from 'ink-text-input';
+import { InputDialog } from '../components/Dialog.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, logoSmall, formatHex } from '../theme.js';
+import { copyToClipboard } from '../utils/clipboard.js';
+import type { TrackedInvitation, InvitationState } from '../../services/invitation-flow.js';
+
+/**
+ * Get color for invitation state.
+ */
+function getStateColor(state: InvitationState): string {
+  switch (state) {
+    case 'created':
+    case 'published':
+      return colors.info as string;
+    case 'pending':
+      return colors.warning as string;
+    case 'ready':
+    case 'signed':
+      return colors.success as string;
+    case 'broadcast':
+    case 'completed':
+      return colors.success as string;
+    case 'expired':
+    case 'error':
+      return colors.error as string;
+    default:
+      return colors.textMuted as string;
+  }
+}
+
+/**
+ * Action menu items.
+ */
+const actionItems = [
+  { label: 'Import Invitation', value: 'import' },
+  { label: 'Copy Invitation ID', value: 'copy' },
+  { label: 'Accept Selected', value: 'accept' },
+  { label: 'Sign & Complete', value: 'sign' },
+  { label: 'View Transaction', value: 'transaction' },
+  { label: 'Refresh', value: 'refresh' },
+];
+
+/**
+ * Invitation Screen Component.
+ */
+export function InvitationScreen(): React.ReactElement {
+  const { navigate, data: navData } = useNavigation();
+  const { invitationController, showError, showInfo } = useAppContext();
+  const { setStatus } = useStatus();
+
+  // State
+  const [invitations, setInvitations] = useState<TrackedInvitation[]>([]);
+  const [selectedIndex, setSelectedIndex] = useState(0);
+  const [selectedActionIndex, setSelectedActionIndex] = useState(0);
+  const [focusedPanel, setFocusedPanel] = useState<'list' | 'details' | 'actions'>('list');
+  const [showImportDialog, setShowImportDialog] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+
+  // Check if we should open import dialog on mount
+  const initialMode = navData.mode as string | undefined;
+
+  /**
+   * Load invitations.
+   */
+  const loadInvitations = useCallback(() => {
+    const tracked = invitationController.getAllInvitations();
+    setInvitations(tracked);
+  }, [invitationController]);
+
+  /**
+   * Set up event listeners and initial load.
+   */
+  useEffect(() => {
+    loadInvitations();
+
+    // Listen for updates
+    const handleUpdate = () => {
+      loadInvitations();
+    };
+
+    invitationController.on('invitation-updated', handleUpdate);
+    invitationController.on('invitation-state-changed', handleUpdate);
+
+    // Show import dialog if mode is 'import'
+    if (initialMode === 'import') {
+      setShowImportDialog(true);
+    }
+
+    return () => {
+      invitationController.off('invitation-updated', handleUpdate);
+      invitationController.off('invitation-state-changed', handleUpdate);
+    };
+  }, [invitationController, loadInvitations, initialMode]);
+
+  // Get selected invitation
+  const selectedInvitation = invitations[selectedIndex];
+
+  /**
+   * Import invitation by ID.
+   */
+  const importInvitation = useCallback(async (invitationId: string) => {
+    setShowImportDialog(false);
+    if (!invitationId.trim()) return;
+
+    try {
+      setIsLoading(true);
+      setStatus('Importing invitation...');
+
+      const tracked = await invitationController.importInvitation(invitationId);
+      await invitationController.publishAndSubscribe(tracked.invitation.invitationIdentifier);
+
+      loadInvitations();
+      showInfo(`Invitation imported!\n\nTemplate: ${tracked.invitation.templateIdentifier}\nAction: ${tracked.invitation.actionIdentifier}`);
+      setStatus('Ready');
+    } catch (error) {
+      showError(`Failed to import: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsLoading(false);
+    }
+  }, [invitationController, loadInvitations, showInfo, showError, setStatus]);
+
+  /**
+   * Accept selected invitation.
+   */
+  const acceptInvitation = useCallback(async () => {
+    if (!selectedInvitation) {
+      showError('No invitation selected');
+      return;
+    }
+
+    try {
+      setIsLoading(true);
+      setStatus('Accepting invitation...');
+
+      await invitationController.acceptInvitation(selectedInvitation.invitation.invitationIdentifier);
+      loadInvitations();
+      showInfo('Invitation accepted! You are now a participant.');
+      setStatus('Ready');
+    } catch (error) {
+      showError(`Failed to accept: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsLoading(false);
+    }
+  }, [selectedInvitation, invitationController, loadInvitations, showInfo, showError, setStatus]);
+
+  /**
+   * Sign selected invitation.
+   */
+  const signInvitation = useCallback(async () => {
+    if (!selectedInvitation) {
+      showError('No invitation selected');
+      return;
+    }
+
+    try {
+      setIsLoading(true);
+      setStatus('Signing invitation...');
+
+      await invitationController.signInvitation(selectedInvitation.invitation.invitationIdentifier);
+      loadInvitations();
+      showInfo('Invitation signed!');
+      setStatus('Ready');
+    } catch (error) {
+      showError(`Failed to sign: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsLoading(false);
+    }
+  }, [selectedInvitation, invitationController, loadInvitations, showInfo, showError, setStatus]);
+
+  /**
+   * Copy invitation ID.
+   */
+  const copyId = useCallback(async () => {
+    if (!selectedInvitation) {
+      showError('No invitation selected');
+      return;
+    }
+
+    try {
+      await copyToClipboard(selectedInvitation.invitation.invitationIdentifier);
+      showInfo(`Copied!\n\n${selectedInvitation.invitation.invitationIdentifier}`);
+    } catch (error) {
+      showError(`Failed to copy: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }, [selectedInvitation, showInfo, showError]);
+
+  /**
+   * Handle action selection.
+   */
+  const handleAction = useCallback((action: string) => {
+    switch (action) {
+      case 'import':
+        setShowImportDialog(true);
+        break;
+      case 'copy':
+        copyId();
+        break;
+      case 'accept':
+        acceptInvitation();
+        break;
+      case 'sign':
+        signInvitation();
+        break;
+      case 'transaction':
+        if (selectedInvitation) {
+          navigate('transaction', { invitationId: selectedInvitation.invitation.invitationIdentifier });
+        }
+        break;
+      case 'refresh':
+        loadInvitations();
+        break;
+    }
+  }, [selectedInvitation, copyId, acceptInvitation, signInvitation, navigate, loadInvitations]);
+
+  // Handle keyboard navigation
+  useInput((input, key) => {
+    // Don't handle input while dialog is open
+    if (showImportDialog) return;
+
+    // Tab to switch panels
+    if (key.tab) {
+      setFocusedPanel(prev => {
+        if (prev === 'list') return 'details';
+        if (prev === 'details') return 'actions';
+        return 'list';
+      });
+      return;
+    }
+
+    // Up/Down navigation
+    if (key.upArrow || input === 'k') {
+      if (focusedPanel === 'list') {
+        setSelectedIndex(prev => Math.max(0, prev - 1));
+      } else if (focusedPanel === 'actions') {
+        setSelectedActionIndex(prev => Math.max(0, prev - 1));
+      }
+    } else if (key.downArrow || input === 'j') {
+      if (focusedPanel === 'list') {
+        setSelectedIndex(prev => Math.min(invitations.length - 1, prev + 1));
+      } else if (focusedPanel === 'actions') {
+        setSelectedActionIndex(prev => Math.min(actionItems.length - 1, prev + 1));
+      }
+    }
+
+    // Enter to select action
+    if (key.return && focusedPanel === 'actions') {
+      const action = actionItems[selectedActionIndex];
+      if (action) {
+        handleAction(action.value);
+      }
+    }
+
+    // 'c' to copy
+    if (input === 'c') {
+      copyId();
+    }
+
+    // 'i' to import
+    if (input === 'i') {
+      setShowImportDialog(true);
+    }
+  }, { isActive: !showImportDialog });
+
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box borderStyle="single" borderColor={colors.secondary} paddingX={1}>
+        <Text color={colors.primary} bold>{logoSmall} - Invitations</Text>
+      </Box>
+
+      {/* Main content - three columns */}
+      <Box flexDirection="row" marginTop={1} flexGrow={1}>
+        {/* Left column: Invitation list */}
+        <Box flexDirection="column" width="40%" paddingRight={1}>
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'list' ? colors.focus : colors.primary}
+            flexDirection="column"
+            paddingX={1}
+            flexGrow={1}
+          >
+            <Text color={colors.primary} bold> Active Invitations </Text>
+            <Box marginTop={1} flexDirection="column">
+              {invitations.length === 0 ? (
+                <Text color={colors.textMuted}>No invitations</Text>
+              ) : (
+                invitations.map((inv, index) => (
+                  <Text
+                    key={inv.invitation.invitationIdentifier}
+                    color={index === selectedIndex ? colors.focus : colors.text}
+                    bold={index === selectedIndex}
+                  >
+                    {index === selectedIndex && focusedPanel === 'list' ? '▸ ' : '  '}
+                    <Text color={getStateColor(inv.state)}>[{inv.state}]</Text>
+                    {' '}{formatHex(inv.invitation.invitationIdentifier, 12)}
+                  </Text>
+                ))
+              )}
+            </Box>
+          </Box>
+        </Box>
+
+        {/* Middle column: Details */}
+        <Box flexDirection="column" width="40%" paddingX={1}>
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'details' ? colors.focus : colors.border}
+            flexDirection="column"
+            paddingX={1}
+            flexGrow={1}
+          >
+            <Text color={colors.primary} bold> Details </Text>
+            <Box marginTop={1} flexDirection="column">
+              {selectedInvitation ? (
+                <>
+                  <Text color={colors.text}>ID: {formatHex(selectedInvitation.invitation.invitationIdentifier, 20)}</Text>
+                  <Text color={colors.text}>
+                    State: <Text color={getStateColor(selectedInvitation.state)}>{selectedInvitation.state}</Text>
+                  </Text>
+                  <Text color={colors.textMuted}>
+                    Template: {selectedInvitation.invitation.templateIdentifier?.slice(0, 20)}...
+                  </Text>
+                  <Text color={colors.textMuted}>
+                    Action: {selectedInvitation.invitation.actionIdentifier}
+                  </Text>
+                  <Box marginTop={1}>
+                    <Text color={colors.warning}>Press 'c' to copy ID</Text>
+                  </Box>
+                </>
+              ) : (
+                <Text color={colors.textMuted}>Select an invitation</Text>
+              )}
+            </Box>
+          </Box>
+        </Box>
+
+        {/* Right column: Actions */}
+        <Box flexDirection="column" width="20%" paddingLeft={1}>
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'actions' ? colors.focus : colors.border}
+            flexDirection="column"
+            paddingX={1}
+            flexGrow={1}
+          >
+            <Text color={colors.primary} bold> Actions </Text>
+            <Box marginTop={1} flexDirection="column">
+              {actionItems.map((item, index) => (
+                <Text
+                  key={item.value}
+                  color={index === selectedActionIndex && focusedPanel === 'actions' ? colors.focus : colors.text}
+                  bold={index === selectedActionIndex && focusedPanel === 'actions'}
+                >
+                  {index === selectedActionIndex && focusedPanel === 'actions' ? '▸ ' : '  '}
+                  {item.label}
+                </Text>
+              ))}
+            </Box>
+          </Box>
+        </Box>
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={1}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: Switch panel • ↑↓: Navigate • Enter: Select • i: Import • c: Copy ID • Esc: Back
+        </Text>
+      </Box>
+
+      {/* Import dialog */}
+      {showImportDialog && (
+        <Box
+          position="absolute"
+          flexDirection="column"
+          alignItems="center"
+          justifyContent="center"
+          width="100%"
+          height="100%"
+        >
+          <InputDialog
+            title="Import Invitation"
+            prompt="Enter Invitation ID:"
+            placeholder="Paste invitation ID..."
+            onSubmit={importInvitation}
+            onCancel={() => setShowImportDialog(false)}
+            isActive={showImportDialog}
+          />
+        </Box>
+      )}
+    </Box>
+  );
+}

src/tui/screens/SeedInput.tsx

@@ -0,0 +1,182 @@
+/**
+ * Seed Input Screen - Initial screen for wallet seed phrase entry.
+ * 
+ * Allows users to enter their BIP39 seed phrase to initialize the wallet.
+ */
+
+import React, { useState, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import TextInput from 'ink-text-input';
+import { Screen } from '../components/Screen.js';
+import { Button, ButtonRow } from '../components/Button.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, logo } from '../theme.js';
+
+/**
+ * Status message type.
+ */
+type StatusType = 'idle' | 'loading' | 'error' | 'success';
+
+/**
+ * Seed Input Screen Component.
+ * Provides seed phrase entry for wallet initialization.
+ */
+export function SeedInputScreen(): React.ReactElement {
+  const { navigate } = useNavigation();
+  const { walletController, showError, setWalletInitialized } = useAppContext();
+  const { setStatus } = useStatus();
+  
+  // State
+  const [seedPhrase, setSeedPhrase] = useState('');
+  const [statusMessage, setStatusMessage] = useState('');
+  const [statusType, setStatusType] = useState<StatusType>('idle');
+  const [focusedElement, setFocusedElement] = useState<'input' | 'button'>('input');
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  /**
+   * Shows a status message with the given type.
+   */
+  const showStatus = useCallback((message: string, type: StatusType) => {
+    setStatusMessage(message);
+    setStatusType(type);
+  }, []);
+
+  /**
+   * Handles seed phrase submission.
+   */
+  const handleSubmit = useCallback(async () => {
+    const seed = seedPhrase.trim();
+
+    // Basic validation
+    if (!seed) {
+      showStatus('Please enter your seed phrase', 'error');
+      return;
+    }
+
+    const wordCount = seed.split(/\s+/).length;
+    if (wordCount !== 12 && wordCount !== 24) {
+      showStatus(`Invalid seed phrase. Expected 12 or 24 words, got ${wordCount}`, 'error');
+      return;
+    }
+
+    // Show loading status
+    showStatus('Initializing wallet...', 'loading');
+    setStatus('Initializing wallet...');
+    setIsSubmitting(true);
+
+    try {
+      // Initialize wallet via controller
+      await walletController.initialize(seed);
+
+      showStatus('Wallet initialized successfully!', 'success');
+      setStatus('Wallet ready');
+      setWalletInitialized(true);
+      
+      // Clear sensitive data before navigating
+      setSeedPhrase('');
+      
+      // Navigate to wallet state screen
+      setTimeout(() => {
+        navigate('wallet');
+      }, 500);
+
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Failed to initialize wallet';
+      showStatus(message, 'error');
+      setStatus('Initialization failed');
+      setIsSubmitting(false);
+    }
+  }, [seedPhrase, walletController, navigate, showStatus, setStatus, setWalletInitialized]);
+
+  // Handle keyboard navigation
+  useInput((input, key) => {
+    if (isSubmitting) return;
+
+    // Tab to switch focus
+    if (key.tab) {
+      setFocusedElement(prev => prev === 'input' ? 'button' : 'input');
+    }
+
+    // Enter on button submits
+    if (key.return && focusedElement === 'button') {
+      handleSubmit();
+    }
+  });
+
+  // Get status color
+  const statusColor = statusType === 'error' ? colors.error :
+                      statusType === 'success' ? colors.success :
+                      statusType === 'loading' ? colors.info :
+                      colors.textMuted;
+
+  // Get border color based on status
+  const inputBorderColor = statusType === 'error' ? colors.error :
+                           statusType === 'success' ? colors.success :
+                           focusedElement === 'input' ? colors.focus :
+                           colors.border;
+
+  return (
+    <Box flexDirection="column" alignItems="center" paddingY={1}>
+      {/* Logo */}
+      <Box marginBottom={1}>
+        <Text color={colors.primary}>{logo}</Text>
+      </Box>
+
+      {/* Title */}
+      <Text color={colors.text} bold>Welcome to XO Wallet CLI</Text>
+      <Text color={colors.textMuted}>Enter your seed phrase to get started</Text>
+
+      {/* Spacer */}
+      <Box marginY={1} />
+
+      {/* Input section */}
+      <Box flexDirection="column" width={64}>
+        <Text color={colors.text} bold>Seed Phrase (12 or 24 words):</Text>
+        <Box 
+          borderStyle="single" 
+          borderColor={inputBorderColor}
+          paddingX={1}
+          marginTop={1}
+        >
+          <TextInput
+            value={seedPhrase}
+            onChange={setSeedPhrase}
+            onSubmit={handleSubmit}
+            placeholder="Enter your seed phrase..."
+            focus={focusedElement === 'input' && !isSubmitting}
+          />
+        </Box>
+
+        {/* Status message */}
+        <Box marginTop={1} height={1}>
+          {statusMessage && (
+            <Text color={statusColor}>
+              {statusType === 'loading' && '⏳ '}
+              {statusType === 'error' && '✗ '}
+              {statusType === 'success' && '✓ '}
+              {statusMessage}
+            </Text>
+          )}
+        </Box>
+
+        {/* Submit button */}
+        <Box justifyContent="center" marginTop={1}>
+          <Button
+            label="Continue"
+            focused={focusedElement === 'button'}
+            disabled={isSubmitting}
+            shortcut="Enter"
+          />
+        </Box>
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={2}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: navigate • Enter: submit • q: quit
+        </Text>
+      </Box>
+    </Box>
+  );
+}

src/tui/screens/TemplateList.tsx

@@ -0,0 +1,255 @@
+/**
+ * Template List Screen - Lists available templates and starting actions.
+ * 
+ * Allows users to:
+ * - View imported templates
+ * - Select a template and action to start a new transaction
+ */
+
+import React, { useState, useEffect, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import { Screen } from '../components/Screen.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, logoSmall } from '../theme.js';
+import type { XOTemplate, XOTemplateStartingActions } from '@xo-cash/types';
+
+/**
+ * Template item with metadata.
+ */
+interface TemplateItem {
+  template: XOTemplate;
+  templateIdentifier: string;
+  startingActions: XOTemplateStartingActions;
+}
+
+/**
+ * Template List Screen Component.
+ * Displays templates and their starting actions.
+ */
+export function TemplateListScreen(): React.ReactElement {
+  const { navigate } = useNavigation();
+  const { walletController, showError } = useAppContext();
+  const { setStatus } = useStatus();
+
+  // State
+  const [templates, setTemplates] = useState<TemplateItem[]>([]);
+  const [selectedTemplateIndex, setSelectedTemplateIndex] = useState(0);
+  const [selectedActionIndex, setSelectedActionIndex] = useState(0);
+  const [focusedPanel, setFocusedPanel] = useState<'templates' | 'actions'>('templates');
+  const [isLoading, setIsLoading] = useState(true);
+
+  /**
+   * Loads templates from the wallet controller.
+   */
+  const loadTemplates = useCallback(async () => {
+    try {
+      setIsLoading(true);
+      setStatus('Loading templates...');
+
+      const templateList = await walletController.getTemplates();
+      const { generateTemplateIdentifier } = await import('@xo-cash/engine');
+
+      const loadedTemplates = await Promise.all(
+        templateList.map(async (template) => {
+          const templateIdentifier = generateTemplateIdentifier(template);
+          const startingActions = await walletController.getStartingActions(templateIdentifier);
+          return { template, templateIdentifier, startingActions };
+        })
+      );
+
+      setTemplates(loadedTemplates);
+      setSelectedTemplateIndex(0);
+      setSelectedActionIndex(0);
+      setStatus('Ready');
+      setIsLoading(false);
+    } catch (error) {
+      showError(`Failed to load templates: ${error instanceof Error ? error.message : String(error)}`);
+      setIsLoading(false);
+    }
+  }, [walletController, setStatus, showError]);
+
+  // Load templates on mount
+  useEffect(() => {
+    loadTemplates();
+  }, [loadTemplates]);
+
+  // Get current template and its actions
+  const currentTemplate = templates[selectedTemplateIndex];
+  const currentActions = currentTemplate?.startingActions ?? [];
+
+  /**
+   * Handles action selection.
+   */
+  const handleActionSelect = useCallback(() => {
+    if (!currentTemplate || currentActions.length === 0) return;
+
+    const action = currentActions[selectedActionIndex];
+    if (!action) return;
+
+    // Navigate to action wizard with selected template and action
+    navigate('wizard', {
+      templateIdentifier: currentTemplate.templateIdentifier,
+      actionIdentifier: action.action,
+      roleIdentifier: action.role,
+      template: currentTemplate.template,
+    });
+  }, [currentTemplate, currentActions, selectedActionIndex, navigate]);
+
+  // Handle keyboard navigation
+  useInput((input, key) => {
+    // Tab to switch panels
+    if (key.tab) {
+      setFocusedPanel(prev => prev === 'templates' ? 'actions' : 'templates');
+      return;
+    }
+
+    // Up/Down navigation
+    if (key.upArrow || input === 'k') {
+      if (focusedPanel === 'templates') {
+        setSelectedTemplateIndex(prev => Math.max(0, prev - 1));
+        setSelectedActionIndex(0); // Reset action selection when template changes
+      } else {
+        setSelectedActionIndex(prev => Math.max(0, prev - 1));
+      }
+    } else if (key.downArrow || input === 'j') {
+      if (focusedPanel === 'templates') {
+        setSelectedTemplateIndex(prev => Math.min(templates.length - 1, prev + 1));
+        setSelectedActionIndex(0); // Reset action selection when template changes
+      } else {
+        setSelectedActionIndex(prev => Math.min(currentActions.length - 1, prev + 1));
+      }
+    }
+
+    // Enter to select action
+    if (key.return && focusedPanel === 'actions') {
+      handleActionSelect();
+    }
+  });
+
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box borderStyle="single" borderColor={colors.secondary} paddingX={1}>
+        <Text color={colors.primary} bold>{logoSmall} - Select Template & Action</Text>
+      </Box>
+
+      {/* Main content - two columns */}
+      <Box flexDirection="row" marginTop={1} flexGrow={1}>
+        {/* Left column: Template list */}
+        <Box flexDirection="column" width="40%" paddingRight={1}>
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'templates' ? colors.focus : colors.primary}
+            flexDirection="column"
+            paddingX={1}
+            flexGrow={1}
+          >
+            <Text color={colors.primary} bold> Templates </Text>
+            <Box marginTop={1} flexDirection="column">
+              {isLoading ? (
+                <Text color={colors.textMuted}>Loading...</Text>
+              ) : templates.length === 0 ? (
+                <Text color={colors.textMuted}>No templates imported</Text>
+              ) : (
+                templates.map((item, index) => (
+                  <Text
+                    key={item.templateIdentifier}
+                    color={index === selectedTemplateIndex ? colors.focus : colors.text}
+                    bold={index === selectedTemplateIndex}
+                  >
+                    {index === selectedTemplateIndex && focusedPanel === 'templates' ? '▸ ' : '  '}
+                    {index + 1}. {item.template.name || 'Unnamed Template'}
+                  </Text>
+                ))
+              )}
+            </Box>
+          </Box>
+        </Box>
+
+        {/* Right column: Actions list */}
+        <Box flexDirection="column" width="60%" paddingLeft={1}>
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'actions' ? colors.focus : colors.border}
+            flexDirection="column"
+            paddingX={1}
+            flexGrow={1}
+          >
+            <Text color={colors.primary} bold> Starting Actions </Text>
+            <Box marginTop={1} flexDirection="column">
+              {!currentTemplate ? (
+                <Text color={colors.textMuted}>Select a template...</Text>
+              ) : currentActions.length === 0 ? (
+                <Text color={colors.textMuted}>No starting actions available</Text>
+              ) : (
+                currentActions.map((action, index) => {
+                  const actionDef = currentTemplate.template.actions?.[action.action];
+                  const name = actionDef?.name || action.action;
+                  return (
+                    <Text
+                      key={`${action.action}-${action.role}`}
+                      color={index === selectedActionIndex ? colors.focus : colors.text}
+                      bold={index === selectedActionIndex}
+                    >
+                      {index === selectedActionIndex && focusedPanel === 'actions' ? '▸ ' : '  '}
+                      {index + 1}. {name} (as {action.role})
+                    </Text>
+                  );
+                })
+              )}
+            </Box>
+          </Box>
+        </Box>
+      </Box>
+
+      {/* Description box */}
+      <Box marginTop={1}>
+        <Box
+          borderStyle="single"
+          borderColor={colors.border}
+          flexDirection="column"
+          paddingX={1}
+          paddingY={1}
+          width="100%"
+        >
+          <Text color={colors.primary} bold> Description </Text>
+          {currentTemplate ? (
+            <Box marginTop={1} flexDirection="column">
+              <Text color={colors.text} bold>
+                {currentTemplate.template.name || 'Unnamed Template'}
+              </Text>
+              <Text color={colors.textMuted}>
+                {currentTemplate.template.description || 'No description available'}
+              </Text>
+              {currentTemplate.template.version !== undefined && (
+                <Text color={colors.text}>
+                  Version: {currentTemplate.template.version}
+                </Text>
+              )}
+              {currentTemplate.template.roles && (
+                <Box marginTop={1} flexDirection="column">
+                  <Text color={colors.text}>Roles:</Text>
+                  {Object.entries(currentTemplate.template.roles).map(([roleId, role]) => (
+                    <Text key={roleId} color={colors.textMuted}>
+                      {'  '}- {role.name || roleId}: {role.description || 'No description'}
+                    </Text>
+                  ))}
+                </Box>
+              )}
+            </Box>
+          ) : (
+            <Text color={colors.textMuted}>Select a template to see details</Text>
+          )}
+        </Box>
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={1}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: Switch list • Enter: Select action • ↑↓: Navigate • Esc: Back
+        </Text>
+      </Box>
+    </Box>
+  );
+}

src/tui/screens/Transaction.tsx

@@ -0,0 +1,372 @@
+/**
+ * Transaction Screen - Reviews and broadcasts transactions.
+ * 
+ * Provides:
+ * - Transaction details review
+ * - Input/output inspection
+ * - Fee calculation display
+ * - Broadcast confirmation
+ */
+
+import React, { useState, useEffect, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import { ConfirmDialog } from '../components/Dialog.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, logoSmall, formatSatoshis, formatHex } from '../theme.js';
+import { copyToClipboard } from '../utils/clipboard.js';
+import type { XOInvitation } from '@xo-cash/types';
+
+/**
+ * Action menu items.
+ */
+const actionItems = [
+  { label: 'Broadcast Transaction', value: 'broadcast' },
+  { label: 'Sign Transaction', value: 'sign' },
+  { label: 'Copy Transaction Hex', value: 'copy' },
+  { label: 'Back to Invitation', value: 'back' },
+];
+
+/**
+ * Transaction Screen Component.
+ */
+export function TransactionScreen(): React.ReactElement {
+  const { navigate, goBack, data: navData } = useNavigation();
+  const { invitationController, showError, showInfo, confirm } = useAppContext();
+  const { setStatus } = useStatus();
+
+  // Extract invitation ID from navigation data
+  const invitationId = navData.invitationId as string | undefined;
+
+  // State
+  const [invitation, setInvitation] = useState<XOInvitation | null>(null);
+  const [focusedPanel, setFocusedPanel] = useState<'inputs' | 'outputs' | 'actions'>('actions');
+  const [selectedActionIndex, setSelectedActionIndex] = useState(0);
+  const [isLoading, setIsLoading] = useState(false);
+  const [showBroadcastConfirm, setShowBroadcastConfirm] = useState(false);
+
+  /**
+   * Load invitation data.
+   */
+  const loadInvitation = useCallback(() => {
+    if (!invitationId) {
+      showError('No invitation ID provided');
+      goBack();
+      return;
+    }
+
+    const tracked = invitationController.getInvitation(invitationId);
+    if (!tracked) {
+      showError('Invitation not found');
+      goBack();
+      return;
+    }
+
+    setInvitation(tracked.invitation);
+  }, [invitationId, invitationController, showError, goBack]);
+
+  // Load on mount
+  useEffect(() => {
+    loadInvitation();
+  }, [loadInvitation]);
+
+  /**
+   * Broadcast transaction.
+   */
+  const broadcastTransaction = useCallback(async () => {
+    if (!invitationId) return;
+
+    setShowBroadcastConfirm(false);
+    setIsLoading(true);
+    setStatus('Broadcasting transaction...');
+
+    try {
+      const txHash = await invitationController.broadcastTransaction(invitationId);
+      showInfo(
+        `Transaction Broadcast Successful!\n\n` +
+        `Transaction Hash:\n${txHash}\n\n` +
+        `The transaction has been submitted to the network.`
+      );
+      navigate('wallet');
+    } catch (error) {
+      showError(`Failed to broadcast: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsLoading(false);
+      setStatus('Ready');
+    }
+  }, [invitationId, invitationController, showInfo, showError, navigate, setStatus]);
+
+  /**
+   * Sign transaction.
+   */
+  const signTransaction = useCallback(async () => {
+    if (!invitationId) return;
+
+    setIsLoading(true);
+    setStatus('Signing transaction...');
+
+    try {
+      await invitationController.signInvitation(invitationId);
+      loadInvitation();
+      showInfo('Transaction signed successfully!');
+    } catch (error) {
+      showError(`Failed to sign: ${error instanceof Error ? error.message : String(error)}`);
+    } finally {
+      setIsLoading(false);
+      setStatus('Ready');
+    }
+  }, [invitationId, invitationController, loadInvitation, showInfo, showError, setStatus]);
+
+  /**
+   * Copy transaction hex.
+   */
+  const copyTransactionHex = useCallback(async () => {
+    if (!invitation) return;
+
+    try {
+      await copyToClipboard(invitation.invitationIdentifier);
+      showInfo(
+        `Copied Invitation ID!\n\n` +
+        `ID: ${invitation.invitationIdentifier}\n` +
+        `Commits: ${invitation.commits.length}`
+      );
+    } catch (error) {
+      showError(`Failed to copy: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }, [invitation, showInfo, showError]);
+
+  /**
+   * Handle action selection.
+   */
+  const handleAction = useCallback((action: string) => {
+    switch (action) {
+      case 'broadcast':
+        setShowBroadcastConfirm(true);
+        break;
+      case 'sign':
+        signTransaction();
+        break;
+      case 'copy':
+        copyTransactionHex();
+        break;
+      case 'back':
+        goBack();
+        break;
+    }
+  }, [signTransaction, copyTransactionHex, goBack]);
+
+  // Handle keyboard navigation
+  useInput((input, key) => {
+    if (showBroadcastConfirm) return;
+
+    // Tab to switch panels
+    if (key.tab) {
+      setFocusedPanel(prev => {
+        if (prev === 'inputs') return 'outputs';
+        if (prev === 'outputs') return 'actions';
+        return 'inputs';
+      });
+      return;
+    }
+
+    // Up/Down in actions
+    if (focusedPanel === 'actions') {
+      if (key.upArrow || input === 'k') {
+        setSelectedActionIndex(prev => Math.max(0, prev - 1));
+      } else if (key.downArrow || input === 'j') {
+        setSelectedActionIndex(prev => Math.min(actionItems.length - 1, prev + 1));
+      }
+    }
+
+    // Enter to select
+    if (key.return && focusedPanel === 'actions') {
+      const action = actionItems[selectedActionIndex];
+      if (action) {
+        handleAction(action.value);
+      }
+    }
+  }, { isActive: !showBroadcastConfirm });
+
+  // Extract transaction data from invitation
+  const commits = invitation?.commits ?? [];
+  const inputs: Array<{ txid: string; index: number; value?: bigint }> = [];
+  const outputs: Array<{ value: bigint; lockingBytecode: string }> = [];
+
+  // Parse commits for inputs and outputs
+  for (const commit of commits) {
+    if (commit.data?.inputs) {
+      for (const input of commit.data.inputs) {
+        // Convert Uint8Array to hex string if needed
+        const txidHex = input.outpointTransactionHash 
+          ? typeof input.outpointTransactionHash === 'string'
+            ? input.outpointTransactionHash
+            : Buffer.from(input.outpointTransactionHash).toString('hex')
+          : 'unknown';
+        
+        inputs.push({
+          txid: txidHex,
+          index: input.outpointIndex ?? 0,
+          value: undefined, // libauth Input doesn't have valueSatoshis directly
+        });
+      }
+    }
+    if (commit.data?.outputs) {
+      for (const output of commit.data.outputs) {
+        // Convert Uint8Array to hex string if needed
+        const lockingBytecodeHex = output.lockingBytecode
+          ? typeof output.lockingBytecode === 'string'
+            ? output.lockingBytecode
+            : Buffer.from(output.lockingBytecode).toString('hex')
+          : 'unknown';
+        
+        outputs.push({
+          value: output.valueSatoshis ?? 0n,
+          lockingBytecode: lockingBytecodeHex,
+        });
+      }
+    }
+  }
+
+  // Calculate totals
+  const totalIn = inputs.reduce((sum, i) => sum + (i.value ?? 0n), 0n);
+  const totalOut = outputs.reduce((sum, o) => sum + o.value, 0n);
+  const fee = totalIn - totalOut;
+
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box borderStyle="single" borderColor={colors.secondary} paddingX={1}>
+        <Text color={colors.primary} bold>{logoSmall} - Transaction Review</Text>
+      </Box>
+
+      {/* Summary box */}
+      <Box
+        borderStyle="single"
+        borderColor={colors.primary}
+        marginTop={1}
+        marginX={1}
+        paddingX={1}
+        flexDirection="column"
+      >
+        <Text color={colors.primary} bold> Transaction Summary </Text>
+        {invitation ? (
+          <Box flexDirection="column" marginTop={1}>
+            <Text color={colors.text}>Inputs: {inputs.length} | Outputs: {outputs.length} | Commits: {commits.length}</Text>
+            <Text color={colors.success}>Total In: {formatSatoshis(totalIn)}</Text>
+            <Text color={colors.warning}>Total Out: {formatSatoshis(totalOut)}</Text>
+            <Text color={colors.info}>Fee: {formatSatoshis(fee)}</Text>
+          </Box>
+        ) : (
+          <Text color={colors.textMuted}>Loading...</Text>
+        )}
+      </Box>
+
+      {/* Inputs and Outputs */}
+      <Box flexDirection="row" marginTop={1} marginX={1} flexGrow={1}>
+        {/* Inputs */}
+        <Box
+          borderStyle="single"
+          borderColor={focusedPanel === 'inputs' ? colors.focus : colors.border}
+          width="50%"
+          flexDirection="column"
+          paddingX={1}
+        >
+          <Text color={colors.primary} bold> Inputs </Text>
+          <Box flexDirection="column" marginTop={1}>
+            {inputs.length === 0 ? (
+              <Text color={colors.textMuted}>No inputs</Text>
+            ) : (
+              inputs.map((input, index) => (
+                <Box key={`${input.txid}-${input.index}`} flexDirection="column" marginBottom={1}>
+                  <Text color={colors.text}>
+                    {index + 1}. {formatHex(input.txid, 12)}:{input.index}
+                  </Text>
+                  {input.value !== undefined && (
+                    <Text color={colors.textMuted}>   {formatSatoshis(input.value)}</Text>
+                  )}
+                </Box>
+              ))
+            )}
+          </Box>
+        </Box>
+
+        {/* Outputs */}
+        <Box
+          borderStyle="single"
+          borderColor={focusedPanel === 'outputs' ? colors.focus : colors.border}
+          width="50%"
+          flexDirection="column"
+          paddingX={1}
+          marginLeft={1}
+        >
+          <Text color={colors.primary} bold> Outputs </Text>
+          <Box flexDirection="column" marginTop={1}>
+            {outputs.length === 0 ? (
+              <Text color={colors.textMuted}>No outputs</Text>
+            ) : (
+              outputs.map((output, index) => (
+                <Box key={index} flexDirection="column" marginBottom={1}>
+                  <Text color={colors.text}>
+                    {index + 1}. {formatSatoshis(output.value)}
+                  </Text>
+                  <Text color={colors.textMuted}>   {formatHex(output.lockingBytecode, 20)}</Text>
+                </Box>
+              ))
+            )}
+          </Box>
+        </Box>
+      </Box>
+
+      {/* Actions */}
+      <Box
+        borderStyle="single"
+        borderColor={focusedPanel === 'actions' ? colors.focus : colors.border}
+        marginTop={1}
+        marginX={1}
+        paddingX={1}
+        flexDirection="column"
+      >
+        <Text color={colors.primary} bold> Actions </Text>
+        <Box flexDirection="column" marginTop={1}>
+          {actionItems.map((item, index) => (
+            <Text
+              key={item.value}
+              color={index === selectedActionIndex && focusedPanel === 'actions' ? colors.focus : colors.text}
+              bold={index === selectedActionIndex && focusedPanel === 'actions'}
+            >
+              {index === selectedActionIndex && focusedPanel === 'actions' ? '▸ ' : '  '}
+              {item.label}
+            </Text>
+          ))}
+        </Box>
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={1} marginX={1}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: Switch focus • Enter: Select • Esc: Back
+        </Text>
+      </Box>
+
+      {/* Broadcast confirmation dialog */}
+      {showBroadcastConfirm && (
+        <Box
+          position="absolute"
+          flexDirection="column"
+          alignItems="center"
+          justifyContent="center"
+          width="100%"
+          height="100%"
+        >
+          <ConfirmDialog
+            title="Broadcast Transaction"
+            message="Are you sure you want to broadcast this transaction? This action cannot be undone."
+            onConfirm={broadcastTransaction}
+            onCancel={() => setShowBroadcastConfirm(false)}
+            isActive={showBroadcastConfirm}
+          />
+        </Box>
+      )}
+    </Box>
+  );
+}

src/tui/screens/WalletState.tsx

@@ -0,0 +1,285 @@
+/**
+ * Wallet State Screen - Displays wallet balances and UTXOs.
+ * 
+ * Shows:
+ * - Total balance
+ * - List of unspent outputs
+ * - Navigation to other actions
+ */
+
+import React, { useState, useEffect, useCallback } from 'react';
+import { Box, Text, useInput } from 'ink';
+import SelectInput from 'ink-select-input';
+import { Screen } from '../components/Screen.js';
+import { List, type ListItem } from '../components/List.js';
+import { useNavigation } from '../hooks/useNavigation.js';
+import { useAppContext, useStatus } from '../hooks/useAppContext.js';
+import { colors, formatSatoshis, formatHex, logoSmall } from '../theme.js';
+
+/**
+ * Menu action items.
+ */
+const menuItems = [
+  { label: 'New Transaction (from template)', value: 'new-tx' },
+  { label: 'Import Invitation', value: 'import' },
+  { label: 'View Invitations', value: 'invitations' },
+  { label: 'Generate New Address', value: 'new-address' },
+  { label: 'Refresh', value: 'refresh' },
+];
+
+/**
+ * UTXO display item.
+ */
+interface UTXOItem {
+  key: string;
+  satoshis: bigint;
+  txid: string;
+  index: number;
+  reserved: boolean;
+}
+
+/**
+ * Wallet State Screen Component.
+ * Displays wallet balance, UTXOs, and action menu.
+ */
+export function WalletStateScreen(): React.ReactElement {
+  const { navigate } = useNavigation();
+  const { walletController, showError, showInfo } = useAppContext();
+  const { setStatus } = useStatus();
+
+  // State
+  const [balance, setBalance] = useState<{ totalSatoshis: bigint; utxoCount: number } | null>(null);
+  const [utxos, setUtxos] = useState<UTXOItem[]>([]);
+  const [focusedPanel, setFocusedPanel] = useState<'menu' | 'utxos'>('menu');
+  const [selectedUtxoIndex, setSelectedUtxoIndex] = useState(0);
+  const [isLoading, setIsLoading] = useState(true);
+
+  /**
+   * Refreshes wallet state.
+   */
+  const refresh = useCallback(async () => {
+    try {
+      setIsLoading(true);
+      setStatus('Loading wallet state...');
+
+      // Get balance
+      const balanceData = await walletController.getBalance();
+      setBalance({
+        totalSatoshis: balanceData.totalSatoshis,
+        utxoCount: balanceData.utxoCount,
+      });
+
+      // Get UTXOs
+      const utxoData = await walletController.getUnspentOutputs();
+      setUtxos(utxoData.map((utxo) => ({
+        key: `${utxo.outpointTransactionHash}:${utxo.outpointIndex}`,
+        satoshis: BigInt(utxo.valueSatoshis),
+        txid: utxo.outpointTransactionHash,
+        index: utxo.outpointIndex,
+        reserved: utxo.reserved ?? false,
+      })));
+
+      setStatus('Wallet ready');
+      setIsLoading(false);
+    } catch (error) {
+      showError(`Failed to load wallet state: ${error instanceof Error ? error.message : String(error)}`);
+      setIsLoading(false);
+    }
+  }, [walletController, setStatus, showError]);
+
+  // Load wallet state on mount
+  useEffect(() => {
+    refresh();
+  }, [refresh]);
+
+  /**
+   * Generates a new receiving address.
+   */
+  const generateNewAddress = useCallback(async () => {
+    try {
+      setStatus('Generating new address...');
+
+      // Get the default P2PKH template
+      const templates = await walletController.getTemplates();
+      const p2pkhTemplate = templates.find(t => t.name?.includes('P2PKH'));
+
+      if (!p2pkhTemplate) {
+        showError('P2PKH template not found');
+        return;
+      }
+
+      // Generate a new locking bytecode
+      const { generateTemplateIdentifier } = await import('@xo-cash/engine');
+      const templateId = generateTemplateIdentifier(p2pkhTemplate);
+
+      const lockingBytecode = await walletController.generateLockingBytecode(
+        templateId,
+        'receiveOutput',
+        'receiver',
+      );
+
+      showInfo(`New address generated!\n\nLocking bytecode:\n${formatHex(lockingBytecode, 40)}`);
+
+      // Refresh to show updated state
+      await refresh();
+    } catch (error) {
+      showError(`Failed to generate address: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }, [walletController, setStatus, showInfo, showError, refresh]);
+
+  /**
+   * Handles menu selection.
+   */
+  const handleMenuSelect = useCallback((item: { value: string }) => {
+    switch (item.value) {
+      case 'new-tx':
+        navigate('templates');
+        break;
+      case 'import':
+        navigate('invitations', { mode: 'import' });
+        break;
+      case 'invitations':
+        navigate('invitations', { mode: 'list' });
+        break;
+      case 'new-address':
+        generateNewAddress();
+        break;
+      case 'refresh':
+        refresh();
+        break;
+    }
+  }, [navigate, generateNewAddress, refresh]);
+
+  // Handle keyboard navigation between panels
+  useInput((input, key) => {
+    if (key.tab) {
+      setFocusedPanel(prev => prev === 'menu' ? 'utxos' : 'menu');
+    }
+  });
+
+  // Convert UTXOs to list items
+  const utxoListItems: ListItem[] = utxos.map((utxo, index) => ({
+    key: utxo.key,
+    label: `${formatSatoshis(utxo.satoshis)} | ${formatHex(utxo.txid, 16)}:${utxo.index}`,
+    description: utxo.reserved ? '[Reserved]' : undefined,
+  }));
+
+  return (
+    <Box flexDirection="column" flexGrow={1}>
+      {/* Header */}
+      <Box borderStyle="single" borderColor={colors.secondary} paddingX={1}>
+        <Text color={colors.primary} bold>{logoSmall} - Wallet Overview</Text>
+      </Box>
+
+      {/* Main content */}
+      <Box flexDirection="row" marginTop={1} flexGrow={1}>
+        {/* Left column: Balance */}
+        <Box 
+          flexDirection="column" 
+          width="50%" 
+          paddingRight={1}
+        >
+          <Box
+            borderStyle="single"
+            borderColor={colors.primary}
+            flexDirection="column"
+            paddingX={1}
+            paddingY={1}
+          >
+            <Text color={colors.primary} bold> Balance </Text>
+            <Box marginTop={1} flexDirection="column">
+              <Text color={colors.text}>Total Balance:</Text>
+              {balance ? (
+                <>
+                  <Text color={colors.success} bold>
+                    {formatSatoshis(balance.totalSatoshis)}
+                  </Text>
+                  <Text color={colors.textMuted}>
+                    UTXOs: {balance.utxoCount}
+                  </Text>
+                </>
+              ) : (
+                <Text color={colors.textMuted}>Loading...</Text>
+              )}
+            </Box>
+          </Box>
+        </Box>
+
+        {/* Right column: Actions menu */}
+        <Box 
+          flexDirection="column" 
+          width="50%" 
+          paddingLeft={1}
+        >
+          <Box
+            borderStyle="single"
+            borderColor={focusedPanel === 'menu' ? colors.focus : colors.border}
+            flexDirection="column"
+            paddingX={1}
+          >
+            <Text color={colors.primary} bold> Actions </Text>
+            <Box marginTop={1}>
+              <SelectInput
+                items={menuItems}
+                onSelect={handleMenuSelect}
+                isFocused={focusedPanel === 'menu'}
+                indicatorComponent={({ isSelected }) => (
+                  <Text color={isSelected ? colors.focus : colors.text}>
+                    {isSelected ? '▸ ' : '  '}
+                  </Text>
+                )}
+                itemComponent={({ isSelected, label }) => (
+                  <Text 
+                    color={isSelected ? colors.text : colors.textMuted}
+                    bold={isSelected}
+                  >
+                    {label}
+                  </Text>
+                )}
+              />
+            </Box>
+          </Box>
+        </Box>
+      </Box>
+
+      {/* UTXO list */}
+      <Box marginTop={1} flexGrow={1}>
+        <Box
+          borderStyle="single"
+          borderColor={focusedPanel === 'utxos' ? colors.focus : colors.border}
+          flexDirection="column"
+          paddingX={1}
+          width="100%"
+        >
+          <Text color={colors.primary} bold> Unspent Outputs (UTXOs) </Text>
+          <Box marginTop={1} flexDirection="column">
+            {isLoading ? (
+              <Text color={colors.textMuted}>Loading...</Text>
+            ) : utxoListItems.length === 0 ? (
+              <Text color={colors.textMuted}>No unspent outputs found</Text>
+            ) : (
+              utxoListItems.map((item, index) => (
+                <Box key={item.key}>
+                  <Text color={index === selectedUtxoIndex && focusedPanel === 'utxos' ? colors.focus : colors.text}>
+                    {index === selectedUtxoIndex && focusedPanel === 'utxos' ? '▸ ' : '  '}
+                    {index + 1}. {item.label}
+                  </Text>
+                  {item.description && (
+                    <Text color={colors.warning}> {item.description}</Text>
+                  )}
+                </Box>
+              ))
+            )}
+          </Box>
+        </Box>
+      </Box>
+
+      {/* Help text */}
+      <Box marginTop={1}>
+        <Text color={colors.textMuted} dimColor>
+          Tab: Switch focus • Enter: Select • ↑↓: Navigate • Esc: Back
+        </Text>
+      </Box>
+    </Box>
+  );
+}

src/tui/screens/index.tsx

@@ -0,0 +1,10 @@
+/**
+ * Export all screen components.
+ */
+
+export { SeedInputScreen } from './SeedInput.js';
+export { WalletStateScreen } from './WalletState.js';
+export { TemplateListScreen } from './TemplateList.js';
+export { ActionWizardScreen } from './ActionWizard.js';
+export { InvitationScreen } from './Invitation.js';
+export { TransactionScreen } from './Transaction.js';

src/tui/theme.ts

@@ -0,0 +1,113 @@
+/**
+ * Theme configuration for the CLI TUI using Ink.
+ * Defines colors, styles, and visual constants used throughout the application.
+ */
+
+import type { TextProps } from 'ink';
+
+/**
+ * Color type - supports Ink color names.
+ */
+export type Color = TextProps['color'];
+
+/**
+ * Color palette for the application.
+ * All colors are compatible with Ink's Text component.
+ */
+export const colors = {
+  // Primary colors
+  primary: 'cyan' as Color,
+  secondary: 'blue' as Color,
+  accent: 'magenta' as Color,
+  
+  // Status colors
+  success: 'green' as Color,
+  warning: 'yellow' as Color,
+  error: 'red' as Color,
+  info: 'cyan' as Color,
+  
+  // Text colors
+  text: 'white' as Color,
+  textMuted: 'gray' as Color,
+  textHighlight: 'whiteBright' as Color,
+  
+  // Background colors
+  bg: 'black' as Color,
+  bgSelected: 'blue' as Color,
+  bgHover: 'gray' as Color,
+  
+  // Border colors
+  border: 'cyan' as Color,
+  borderFocused: 'yellowBright' as Color,
+  borderMuted: 'gray' as Color,
+  
+  // Focus highlight color (very visible)
+  focus: 'yellowBright' as Color,
+} as const;
+
+/**
+ * Layout constants for consistent spacing.
+ */
+export const layout = {
+  padding: {
+    small: 1,
+    medium: 2,
+    large: 3,
+  },
+  margin: {
+    small: 1,
+    medium: 2,
+    large: 3,
+  },
+} as const;
+
+/**
+ * ASCII art logo for the application header.
+ */
+export const logo = `
+ ██╗  ██╗ ██████╗     ██╗    ██╗ █████╗ ██╗     ██╗     ███████╗████████╗
+ ╚██╗██╔╝██╔═══██╗    ██║    ██║██╔══██╗██║     ██║     ██╔════╝╚══██╔══╝
+  ╚███╔╝ ██║   ██║    ██║ █╗ ██║███████║██║     ██║     █████╗     ██║   
+  ██╔██╗ ██║   ██║    ██║███╗██║██╔══██║██║     ██║     ██╔══╝     ██║   
+ ██╔╝ ██╗╚██████╔╝    ╚███╔███╔╝██║  ██║███████╗███████╗███████╗   ██║   
+ ╚═╝  ╚═╝ ╚═════╝      ╚══╝╚══╝ ╚═╝  ╚═╝╚══════╝╚══════╝╚══════╝   ╚═╝   
+`.trim();
+
+/**
+ * Small logo for status bar.
+ */
+export const logoSmall = 'XO Wallet';
+
+/**
+ * Helper to format satoshis for display.
+ * @param satoshis - Amount in satoshis
+ * @returns Formatted string with BCH amount
+ */
+export function formatSatoshis(satoshis: bigint | number): string {
+  const value = typeof satoshis === 'bigint' ? satoshis : BigInt(satoshis);
+  const bch = Number(value) / 100_000_000;
+  return `${bch.toFixed(8)} BCH (${value.toLocaleString()} sats)`;
+}
+
+/**
+ * Helper to truncate long strings with ellipsis.
+ * @param str - String to truncate
+ * @param maxLength - Maximum length
+ * @returns Truncated string
+ */
+export function truncate(str: string, maxLength: number): string {
+  if (str.length <= maxLength) return str;
+  return str.slice(0, maxLength - 3) + '...';
+}
+
+/**
+ * Helper to format a hex string for display.
+ * @param hex - Hex string
+ * @param maxLength - Maximum display length
+ * @returns Formatted hex string
+ */
+export function formatHex(hex: string, maxLength: number = 16): string {
+  if (hex.length <= maxLength) return hex;
+  const half = Math.floor((maxLength - 3) / 2);
+  return `${hex.slice(0, half)}...${hex.slice(-half)}`;
+}

src/tui/types.ts

@@ -0,0 +1,91 @@
+/**
+ * Shared types for the CLI TUI.
+ */
+
+import type { WalletController } from '../controllers/wallet-controller.js';
+import type { InvitationController } from '../controllers/invitation-controller.js';
+
+/**
+ * Screen names for navigation.
+ */
+export type ScreenName = 
+  | 'seed-input'
+  | 'wallet'
+  | 'templates'
+  | 'wizard'
+  | 'invitations'
+  | 'transaction';
+
+/**
+ * Navigation context data that can be passed between screens.
+ */
+export interface NavigationData {
+  /** Template identifier for wizard */
+  templateId?: string;
+  /** Action identifier for wizard */
+  actionId?: string;
+  /** Role identifier for wizard */
+  roleId?: string;
+  /** Invitation ID for transaction screen */
+  invitationId?: string;
+  /** Any additional data */
+  [key: string]: unknown;
+}
+
+/**
+ * Navigation context interface.
+ */
+export interface NavigationContextType {
+  /** Current screen name */
+  screen: ScreenName;
+  /** Data passed to the current screen */
+  data: NavigationData;
+  /** Navigation history stack */
+  history: ScreenName[];
+  /** Navigate to a new screen */
+  navigate: (screen: ScreenName, data?: NavigationData) => void;
+  /** Go back to the previous screen */
+  goBack: () => void;
+  /** Check if we can go back */
+  canGoBack: boolean;
+}
+
+/**
+ * App context interface - provides access to controllers and app-level functions.
+ */
+export interface AppContextType {
+  /** Wallet controller for wallet operations */
+  walletController: WalletController;
+  /** Invitation controller for invitation operations */
+  invitationController: InvitationController;
+  /** Show an error message dialog */
+  showError: (message: string) => void;
+  /** Show an info message dialog */
+  showInfo: (message: string) => void;
+  /** Show a confirmation dialog */
+  confirm: (message: string) => Promise<boolean>;
+  /** Exit the application */
+  exit: () => void;
+  /** Update status bar message */
+  setStatus: (message: string) => void;
+  /** Whether the wallet is initialized */
+  isWalletInitialized: boolean;
+  /** Set wallet initialized state */
+  setWalletInitialized: (initialized: boolean) => void;
+}
+
+/**
+ * Dialog state for modals.
+ */
+export interface DialogState {
+  /** Whether dialog is visible */
+  visible: boolean;
+  /** Dialog type */
+  type: 'error' | 'info' | 'confirm';
+  /** Dialog message */
+  message: string;
+  /** Callback for confirm dialog */
+  onConfirm?: () => void;
+  /** Callback for cancel/dismiss */
+  onCancel?: () => void;
+}

src/tui/utils/clipboard.ts

@@ -0,0 +1,62 @@
+/**
+ * Cross-platform clipboard utility with multiple fallback methods.
+ */
+
+import { exec } from 'child_process';
+import { promisify } from 'util';
+
+const execAsync = promisify(exec);
+
+/**
+ * Attempts to copy text to clipboard using multiple methods.
+ * Tries native commands first (most reliable), then clipboardy as fallback.
+ * 
+ * @param text - The text to copy to clipboard
+ * @returns Promise that resolves on success, rejects with error message on failure
+ */
+export async function copyToClipboard(text: string): Promise<void> {
+  const platform = process.platform;
+  
+  // Escape the text for shell commands
+  const escapedText = text.replace(/'/g, "'\\''");
+  
+  // Try native commands first - they're more reliable
+  try {
+    if (platform === 'darwin') {
+      // macOS - use pbcopy directly
+      await execAsync(`printf '%s' '${escapedText}' | pbcopy`);
+      return;
+    } else if (platform === 'linux') {
+      // Linux - try xclip, then xsel
+      try {
+        await execAsync(`printf '%s' '${escapedText}' | xclip -selection clipboard`);
+        return;
+      } catch {
+        try {
+          await execAsync(`printf '%s' '${escapedText}' | xsel --clipboard --input`);
+          return;
+        } catch {
+          // Fall through to clipboardy
+        }
+      }
+    } else if (platform === 'win32') {
+      // Windows - use clip.exe
+      await execAsync(`echo|set /p="${text}" | clip`);
+      return;
+    }
+  } catch {
+    // Native command failed, try clipboardy
+  }
+  
+  // Fallback to clipboardy
+  try {
+    const clipboard = await import('clipboardy');
+    await clipboard.default.write(text);
+    return;
+  } catch {
+    // clipboardy also failed
+  }
+  
+  // All methods failed
+  throw new Error(`Clipboard not available. Install xclip or xsel on Linux.`);
+}

src/utils/exponential-backoff.ts

@@ -0,0 +1,155 @@
+/**
+ * Exponential backoff is a technique used to retry a function after a delay.
+ *
+ * The delay increases exponentially with each attempt, up to a maximum delay.
+ *
+ * The jitter is a random amount of time added to the delay to prevent thundering herd problems.
+ *
+ * The growth rate is the factor by which the delay increases with each attempt.
+ */
+export class ExponentialBackoff {
+  /**
+   * Create a new ExponentialBackoff instance
+   *
+   * @param config - The configuration for the exponential backoff
+   * @returns The ExponentialBackoff instance
+   */
+  static from(config?: Partial<ExponentialBackoffOptions>): ExponentialBackoff {
+    const backoff = new ExponentialBackoff(config);
+    return backoff;
+  }
+
+  /**
+   * Run the function with exponential backoff
+   *
+   * @param fn - The function to run
+   * @param onError - The callback to call when an error occurs
+   * @param options - The configuration for the exponential backoff
+   *
+   * @throws The last error if the function fails and we have hit the max attempts
+   *
+   * @returns The result of the function
+   */
+  static run<T>(
+    fn: () => Promise<T>,
+    onError = (_error: Error) => {},
+    options?: Partial<ExponentialBackoffOptions>,
+  ): Promise<T> {
+    const backoff = ExponentialBackoff.from(options);
+    return backoff.run(fn, onError);
+  }
+
+  private readonly options: ExponentialBackoffOptions;
+
+  constructor(options?: Partial<ExponentialBackoffOptions>) {
+    this.options = {
+      maxDelay: 10000,
+      maxAttempts: 10,
+      baseDelay: 1000,
+      growthRate: 2,
+      jitter: 0.1,
+      ...options,
+    };
+  }
+
+  /**
+   * Run the function with exponential backoff
+   *
+   * If the function fails but we have not hit the max attempts, the error will be passed to the onError callback
+   * and the function will be retried with an exponential delay
+   *
+   * If the function fails and we have hit the max attempts, the last error will be thrown
+   *
+   * @param fn - The function to run
+   * @param onError - The callback to call when an error occurs
+   *
+   * @throws The last error if the function fails and we have hit the max attempts
+   *
+   * @returns The result of the function
+   */
+  async run<T>(
+    fn: () => Promise<T>,
+    onError = (_error: Error) => {},
+  ): Promise<T> {
+    let lastError: Error = new Error('Exponential backoff: Max retries hit');
+
+    let attempt = 0;
+
+    while (
+      attempt < this.options.maxAttempts ||
+      this.options.maxAttempts == 0
+    ) {
+      try {
+        return await fn();
+      } catch (error) {
+        // Store the error in case we fail every attempt
+        lastError = error instanceof Error ? error : new Error(`${error}`);
+        onError(lastError);
+
+        // Wait before going to the next attempt
+        const delay = this.calculateDelay(attempt);
+        await new Promise((resolve) => setTimeout(resolve, delay));
+      }
+
+      attempt++;
+    }
+
+    // We completed the loop without ever succeeding. Throw the last error we got
+    throw lastError;
+  }
+
+  /**
+   * Calculate the delay before we should attempt to retry
+   *
+   * NOTE: The maximum delay is (maxDelay * (1 + jitter))
+   *
+   * @param attempt
+   * @returns The time in milliseconds before another attempt should be made
+   */
+  private calculateDelay(attempt: number): number {
+    // Get the power of the growth rate
+    const power = Math.pow(this.options.growthRate, attempt);
+
+    // Get the delay before jitter or limit
+    const rawDelay = this.options.baseDelay * power;
+
+    // Cap the delay to the maximum. Do this before the jitter so jitter does not become larger than delay
+    const cappedDelay = Math.min(rawDelay, this.options.maxDelay);
+
+    // Get the jitter direction. This will be between -1 and 1
+    const jitterDirection = 2 * Math.random() - 1;
+
+    // Calculate the jitter
+    const jitter = jitterDirection * this.options.jitter * cappedDelay;
+
+    // Add the jitter to the delay
+    return cappedDelay + jitter;
+  }
+}
+
+export type ExponentialBackoffOptions = {
+  /**
+   * The maximum delay between attempts in milliseconds
+   */
+  maxDelay: number;
+
+  /**
+   * The maximum number of attempts. Passing 0 will result in infinite attempts.
+   */
+  maxAttempts: number;
+
+  /**
+   * The base delay between attempts in milliseconds
+   */
+  baseDelay: number;
+
+  /**
+   * The growth rate of the delay
+   */
+  growthRate: number;
+
+  /**
+   * The jitter of the delay as a percentage of growthRate
+   */
+  jitter: number;
+};

src/utils/ext-json.ts

@@ -0,0 +1,158 @@
+/**
+ * Extended JSON encoding/decoding utilities.
+ * Handles BigInt and Uint8Array serialization for communication with sync-server.
+ * 
+ * TODO: These are intended as temporary stand-ins until this functionality has been implemented directly in LibAuth.
+ *       We are doing this so that we may better standardize with the rest of the BCH eco-system in future.
+ *       See: https://github.com/bitauth/libauth/pull/108
+ */
+
+import { binToHex, hexToBin } from '@bitauth/libauth';
+
+/**
+ * Replaces BigInt and Uint8Array values with their ExtJSON string representations.
+ * @param value - The value to potentially replace
+ * @returns The replaced value as an ExtJSON string, or the original value
+ */
+export const extendedJsonReplacer = function (value: unknown): unknown {
+  if (typeof value === 'bigint') {
+    return `<bigint: ${value.toString()}n>`;
+  } else if (value instanceof Uint8Array) {
+    return `<Uint8Array: ${binToHex(value)}>`;
+  }
+
+  return value;
+};
+
+/**
+ * Revives ExtJSON string representations back to their original types.
+ * @param value - The value to potentially revive
+ * @returns The revived value (BigInt or Uint8Array), or the original value
+ */
+export const extendedJsonReviver = function (value: unknown): unknown {
+  // Define RegEx that matches our Extended JSON fields.
+  const bigIntRegex = /^<bigint: (?<bigint>[+-]?[0-9]*)n>$/;
+  const uint8ArrayRegex = /^<Uint8Array: (?<hex>[a-f0-9]*)>$/;
+
+  // Only perform a check if the value is a string.
+  // NOTE: We can skip all other values as all Extended JSON encoded fields WILL be a string.
+  if (typeof value === 'string') {
+    // Check if this value matches an Extended JSON encoded bigint.
+    const bigintMatch = value.match(bigIntRegex);
+    if (bigintMatch) {
+      // Access the named group directly instead of using array indices
+      const { bigint } = bigintMatch.groups!;
+
+      // Return the value casted to bigint.
+      return BigInt(bigint!);
+    }
+
+    const uint8ArrayMatch = value.match(uint8ArrayRegex);
+    if (uint8ArrayMatch) {
+      // Access the named group directly instead of using array indices
+      const { hex } = uint8ArrayMatch.groups!;
+
+      // Return the value casted to Uint8Array.
+      return hexToBin(hex!);
+    }
+  }
+
+  // Return the original value.
+  return value;
+};
+
+/**
+ * Recursively encodes an object to ExtJSON format.
+ * @param value - The value to encode
+ * @returns The ExtJSON encoded value
+ */
+export const encodeExtendedJsonObject = function (value: unknown): unknown {
+  // If this is an object type (and it is not null - which is technically an "object")...
+  // ... and it is not an ArrayBuffer (e.g. Uint8Array) which is also technically an "object...
+  if (
+    typeof value === 'object' &&
+    value !== null &&
+    !ArrayBuffer.isView(value)
+  ) {
+    // If this is an array, recursively call this function on each value.
+    if (Array.isArray(value)) {
+      return value.map(encodeExtendedJsonObject);
+    }
+
+    // Declare object to store extended JSON entries.
+    const encodedObject: Record<string, unknown> = {};
+
+    // Iterate through each entry and encode it to extended JSON.
+    for (const [key, valueToEncode] of Object.entries(value as Record<string, unknown>)) {
+      encodedObject[key] = encodeExtendedJsonObject(valueToEncode);
+    }
+
+    // Return the extended JSON encoded object.
+    return encodedObject;
+  }
+
+  // Return the replaced value.
+  return extendedJsonReplacer(value);
+};
+
+/**
+ * Recursively decodes an ExtJSON object back to its original types.
+ * @param value - The ExtJSON value to decode
+ * @returns The decoded value with BigInt and Uint8Array restored
+ */
+export const decodeExtendedJsonObject = function (value: unknown): unknown {
+  // If this is an object type (and it is not null - which is technically an "object")...
+  // ... and it is not an ArrayBuffer (e.g. Uint8Array) which is also technically an "object...
+  if (
+    typeof value === 'object' &&
+    value !== null &&
+    !ArrayBuffer.isView(value)
+  ) {
+    // If this is an array, recursively call this function on each value.
+    if (Array.isArray(value)) {
+      return value.map(decodeExtendedJsonObject);
+    }
+
+    // Declare object to store decoded JSON entries.
+    const decodedObject: Record<string, unknown> = {};
+
+    // Iterate through each entry and decode it from extended JSON.
+    for (const [key, valueToEncode] of Object.entries(value as Record<string, unknown>)) {
+      decodedObject[key] = decodeExtendedJsonObject(valueToEncode);
+    }
+
+    // Return the extended JSON encoded object.
+    return decodedObject;
+  }
+
+  // Return the revived value.
+  return extendedJsonReviver(value);
+};
+
+/**
+ * Encodes a value to an ExtJSON string.
+ * @param value - The value to encode
+ * @param space - Optional spacing for pretty printing
+ * @returns The ExtJSON encoded string
+ */
+export const encodeExtendedJson = function (
+  value: unknown,
+  space: number | undefined = undefined,
+): string {
+  const replacedObject = encodeExtendedJsonObject(value);
+  const stringifiedObject = JSON.stringify(replacedObject, null, space);
+
+  return stringifiedObject;
+};
+
+/**
+ * Decodes an ExtJSON string back to its original value.
+ * @param json - The ExtJSON string to decode
+ * @returns The decoded value with BigInt and Uint8Array restored
+ */
+export const decodeExtendedJson = function (json: string): unknown {
+  const parsedObject = JSON.parse(json) as unknown;
+  const revivedObject = decodeExtendedJsonObject(parsedObject);
+
+  return revivedObject;
+};

src/utils/sse-client.ts

@@ -0,0 +1,427 @@
+import { ExponentialBackoff } from './exponential-backoff.js';
+
+// Type declarations for browser environment (not available in Node.js)
+declare const document: {
+  visibilityState: 'visible' | 'hidden';
+  addEventListener: (event: string, handler: (event: Event) => void) => void;
+  removeEventListener: (event: string, handler: (event: Event) => void) => void;
+} | undefined;
+
+/**
+ * A Server-Sent Events client implementation using fetch API.
+ * Supports custom headers, POST requests, and is non-blocking.
+ */
+export class SSESession {
+  /**
+   * Creates and connects a new SSESession instance.
+   * @param url The URL to connect to
+   * @param options Configuration options
+   * @returns A new connected SSESession instance
+   */
+  public static async from(
+    url: string,
+    options: Partial<SSESessionOptions> = {},
+  ): Promise<SSESession> {
+    const client = new SSESession(url, options);
+    await client.connect();
+    return client;
+  }
+
+  // State.
+  private url: string;
+  private controller: AbortController;
+  private connected: boolean = false;
+  protected options: SSESessionOptions;
+  protected messageBuffer: Uint8Array = new Uint8Array();
+
+  // Listener for when the tab is hidden or shown.
+  private visibilityChangeHandler: ((event: Event) => void) | null = null;
+
+  // Text decoders and encoders for parsing the message buffer.
+  private textDecoder: TextDecoder = new TextDecoder();
+  private textEncoder: TextEncoder = new TextEncoder();
+
+  /**
+   * Creates a new SSESession instance.
+   * @param url The URL to connect to
+   * @param options Configuration options
+   */
+  constructor(url: string, options: Partial<SSESessionOptions> = {}) {
+    this.url = url;
+    this.options = {
+      // Use default fetch function.
+      fetch: (...args) => fetch(...args),
+      method: 'GET',
+      headers: {
+        Accept: 'text/event-stream',
+        'Cache-Control': 'no-cache',
+      },
+      onConnected: () => {},
+      onMessage: () => {},
+      onError: (error) => console.error('SSESession error:', error),
+      onDisconnected: () => {},
+      onReconnect: (options) => Promise.resolve(options),
+
+      // Reconnection options
+      attemptReconnect: true,
+      retryDelay: 1000,
+      persistent: false,
+      ...options,
+    };
+    this.controller = new AbortController();
+
+    // Set up visibility change handling if in mobile browser environment
+    if (typeof document !== 'undefined') {
+      this.visibilityChangeHandler = this.handleVisibilityChange.bind(this);
+      document.addEventListener(
+        'visibilitychange',
+        this.visibilityChangeHandler,
+      );
+    }
+  }
+
+  /**
+   * Handles visibility change events in the browser.
+   */
+  private async handleVisibilityChange(): Promise<void> {
+    // Guard for Node.js environment where document is undefined
+    if (typeof document === 'undefined') return;
+
+    // When going to background, close the current connection cleanly
+    // This allows us to reconnect mobile devices when they come back after leaving the tab or browser app.
+    if (document.visibilityState === 'hidden') {
+      this.controller.abort();
+    }
+
+    // When coming back to foreground, attempt to reconnect if not connected
+    if (document.visibilityState === 'visible' && !this.connected) {
+      await this.connect();
+    }
+  }
+
+  /**
+   * Connects to the SSE endpoint.
+   */
+  public async connect(): Promise<void> {
+    if (this.connected) return;
+
+    this.connected = true;
+    this.controller = new AbortController();
+
+    const { method, headers, body } = this.options;
+
+    const fetchOptions: RequestInit = {
+      method,
+      headers: headers || {},
+      body: body || null,
+      signal: this.controller.signal,
+      cache: 'no-store',
+    };
+
+    const exponentialBackoff = ExponentialBackoff.from({
+      baseDelay: this.options.retryDelay,
+      maxDelay: 10000,
+      maxAttempts: 0,
+      growthRate: 1.3,
+      jitter: 0.3,
+    });
+
+    // Establish the connection and get the reader using the exponential backoff
+    const reader = await exponentialBackoff.run(async () => {
+      const reconnectOptions = await this.handleCallback(
+        this.options.onReconnect,
+        fetchOptions,
+      );
+
+      const updatedFetchOptions = {
+        ...fetchOptions,
+        ...reconnectOptions,
+      };
+
+      const res = await this.options.fetch(this.url, updatedFetchOptions);
+      if (!res.ok) {
+        throw new Error(`HTTP error! Status: ${res.status}`);
+      }
+
+      if (!res.body) {
+        throw new Error('Response body is null');
+      }
+
+      return res.body.getReader();
+    });
+
+    // Call the onConnected callback
+    this.handleCallback(this.options.onConnected);
+
+    const readStream = async () => {
+      try {
+        while (true) {
+          const { done, value } = await reader.read();
+
+          if (done) {
+            this.connected = false;
+
+            // Call the onDisconnected callback.
+            this.handleCallback(this.options.onDisconnected, undefined);
+
+            // If the connection was closed by the server, we want to attempt a reconnect if the connection should be persistent.
+            if (this.options.persistent) {
+              await this.connect();
+            }
+
+            break;
+          }
+
+          const events = this.parseEvents(value);
+
+          for (const event of events) {
+            if (this.options.onMessage) {
+              this.handleCallback(this.options.onMessage, event);
+            }
+          }
+        }
+      } catch (error) {
+        this.connected = false;
+
+        // Call the onDisconnected callback.
+        this.handleCallback(this.options.onDisconnected, error);
+
+        // If the connection was aborted using the controller, we don't need to call onError.
+        if (this.controller.signal.aborted) {
+          return;
+        }
+
+        // Call the onError callback.
+        // NOTE: we dont use the handleCallback here because it would result in 2 error callbacks.
+        try {
+          this.options.onError(error);
+        } catch (error) {
+          console.log(`SSE Session: onError callback error:`, error);
+        }
+
+        // Attempt to reconnect if enabled
+        if (this.options.attemptReconnect) {
+          await this.connect();
+        }
+      }
+    };
+
+    readStream();
+
+    return;
+  }
+
+  protected parseEvents(chunk: Uint8Array): SSEvent[] {
+    // Append new chunk to existing buffer
+    this.messageBuffer = new Uint8Array([...this.messageBuffer, ...chunk]);
+
+    const events: SSEvent[] = [];
+    const lines = this.textDecoder
+      .decode(this.messageBuffer)
+      .split(/\r\n|\r|\n/);
+
+    let currentEvent: Partial<SSEvent> = {};
+    let completeEventCount = 0;
+
+    // Iterate over the lines to find complete events
+    for (let i = 0; i < lines.length; i++) {
+      const line = lines[i];
+
+      // Empty line signals the end of an event
+      if (line === '') {
+        if (currentEvent.data) {
+          // Remove trailing newline if present
+          currentEvent.data = currentEvent.data.replace(/\n$/, '');
+          events.push(currentEvent as SSEvent);
+          currentEvent = {};
+          completeEventCount = i + 1;
+        }
+        continue;
+      }
+
+      if (!line) continue;
+
+      // Parse field: value format
+      const colonIndex = line.indexOf(':');
+      if (colonIndex === -1) continue;
+
+      const field = line.slice(0, colonIndex);
+      // Skip initial space after colon if present
+      const valueStartIndex =
+        colonIndex + 1 + (line[colonIndex + 1] === ' ' ? 1 : 0);
+      const value = line.slice(valueStartIndex);
+
+      if (field === 'data') {
+        currentEvent.data = currentEvent.data
+          ? currentEvent.data + '\n' + value
+          : value;
+      } else if (field === 'event') {
+        currentEvent.event = value;
+      } else if (field === 'id') {
+        currentEvent.id = value;
+      } else if (field === 'retry') {
+        const retryMs = parseInt(value, 10);
+        if (!isNaN(retryMs)) {
+          currentEvent.retry = retryMs;
+        }
+      }
+    }
+
+    // Store the remainder of the buffer for the next chunk
+    const remainder = lines.slice(completeEventCount).join('\n');
+    this.messageBuffer = this.textEncoder.encode(remainder);
+
+    return events;
+  }
+
+  /**
+   * Override the onMessage callback.
+   *
+   * @param onMessage The callback to set.
+   */
+  public setOnMessage(onMessage: (event: SSEvent) => void): void {
+    this.options.onMessage = onMessage;
+  }
+
+  /**
+   * Closes the SSE connection and cleans up event listeners.
+   */
+  public close(): void {
+    // Clean up everything including the visibility handler
+    this.controller.abort();
+
+    // Remove the visibility handler (This is only required on browsers)
+    if (this.visibilityChangeHandler && typeof document !== 'undefined') {
+      document.removeEventListener(
+        'visibilitychange',
+        this.visibilityChangeHandler,
+      );
+      this.visibilityChangeHandler = null;
+    }
+  }
+
+  /**
+   * Checks if the client is currently connected.
+   * @returns Whether the client is connected
+   */
+  public isConnected(): boolean {
+    return this.connected;
+  }
+
+  /**
+   * Will handle thrown errors from the callback and call the onError callback.
+   * This is to avoid the sse-session from disconnecting from errors that are not a result of the sse-session itself.
+   *
+   * @param callback The callback to handle.
+   * @param args The arguments to pass to the callback.
+   */
+  private handleCallback<T extends (...args: Parameters<T>) => ReturnType<T>>(
+    callback: T,
+    ...args: Parameters<T>
+  ): ReturnType<T> | undefined {
+    try {
+      return callback(...args);
+    } catch (error) {
+      try {
+        this.options.onError(error);
+      } catch (error) {
+        console.log(`SSE Session: onError callback error:`, error);
+      }
+    }
+  }
+}
+
+/**
+ * Configuration options for the SSESession.
+ */
+export interface SSESessionOptions {
+  /**
+   * The fetch function to use.
+   *
+   * NOTE: This is compatible with Browser/Node's native "fetcH" function.
+   *       We use this in place of "typeof fetch" so that we can accept non-standard URLs ("url" is a "string" here).
+   *       For example, a LibP2P adapter might not use a standardized URL format (and might only include "path").
+   *       This would cause a type error as native fetch expects type "URL".
+   */
+  fetch: (url: string, options: RequestInit) => Promise<Response>;
+
+  /**
+   * HTTP method to use (GET or POST).
+   */
+  method: 'GET' | 'POST';
+
+  /**
+   * HTTP headers to send with the request.
+   */
+  headers?: Record<string, string>;
+
+  /**
+   * Body to send with POST requests.
+   */
+  body?: string | FormData;
+
+  /**
+   * Called when the connection is established.
+   */
+  onConnected: () => void;
+
+  /**
+   * Called when a message is received.
+   */
+  onMessage: (event: SSEvent) => void;
+
+  /**
+   * Called when an error occurs.
+   */
+  onError: (error: unknown) => void;
+
+  /**
+   * Called when the connection is closed.
+   */
+  onDisconnected: (error: unknown) => void;
+
+  /*
+   * Called when the connection is going to try to reconnect.
+   */
+  onReconnect: (options: RequestInit) => Promise<RequestInit>;
+
+  /**
+   * Whether to attempt to reconnect.
+   */
+  attemptReconnect: boolean;
+
+  /**
+   * The delay in milliseconds between reconnection attempts.
+   */
+  retryDelay: number;
+
+  /**
+   * Whether to reconnect when the session is terminated by the server.
+   */
+  persistent: boolean;
+}
+
+/**
+ * Represents a Server-Sent Event.
+ */
+export interface SSEvent {
+  /**
+   * Event data.
+   */
+  data: string;
+
+  /**
+   * Event type.
+   */
+  event?: string;
+
+  /**
+   * Event ID.
+   */
+  id?: string;
+
+  /**
+   * Reconnection time in milliseconds.
+   */
+  retry?: number;
+}

tsconfig.json

@@ -0,0 +1,47 @@
+{
+  // Visit https://aka.ms/tsconfig to read more about this file
+  "compilerOptions": {
+    // File Layout
+    "rootDir": "./src",
+    "outDir": "./dist",
+
+    // Environment Settings
+    // See also https://aka.ms/tsconfig/module
+    "module": "nodenext",
+    "target": "esnext",
+    // For nodejs:
+    "lib": ["esnext"],
+    "types": ["node"],
+
+    // JSX Support for Ink/React
+    "jsx": "react-jsx",
+
+    // Other Outputs
+    "sourceMap": true,
+    "declaration": true,
+    "declarationMap": true,
+
+    // Stricter Typechecking Options
+    "noUncheckedIndexedAccess": true,
+    // Note: exactOptionalPropertyTypes disabled for Ink compatibility
+    // "exactOptionalPropertyTypes": true,
+
+    // Style Options
+    // "noImplicitReturns": true,
+    // "noImplicitOverride": true,
+    // "noUnusedLocals": true,
+    // "noUnusedParameters": true,
+    // "noFallthroughCasesInSwitch": true,
+    // "noPropertyAccessFromIndexSignature": true,
+
+    // Recommended Options
+    "strict": true,
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
+    "noUncheckedSideEffectImports": true,
+    "moduleDetection": "force",
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}