Add currency settings, Settings service, and dialog to select fiat currency. Add support for non Official currencies like DOGE when using rates.

src/tui/screens/WalletState.tsx

@@ -11,6 +11,7 @@ import React, { useState, useEffect, useCallback, useMemo } from 'react';
 import { Box, Text } from 'ink';
 import { ScrollableList, type ListItemData } from '../components/List.js';
 import { QRCode } from '../components/QRCode.js';
+import { CurrencySelectionDialog } from '../components/CurrencySelectionDialog.js';
 import { useNavigation } from '../hooks/useNavigation.js';
 import { useAppContext, useStatus } from '../hooks/useAppContext.js';
 import { useSatoshisConversion } from '../hooks/useSatoshisConversion.js';
@@ -60,6 +61,7 @@ const menuItems: ListItemData<string>[] = [
   { key: 'import', label: 'Import Invitation', value: 'import' },
   { key: 'invitations', label: 'View Invitations', value: 'invitations' },
   { key: 'new-address', label: 'Generate New Address', value: 'new-address' },
+  { key: 'set-currency', label: 'Set Fiat Currency', value: 'set-currency' },
   { key: 'unreserve-all', label: 'Unreserve All Resources', value: 'unreserve-all' },
   { key: 'refresh', label: 'Refresh', value: 'refresh' },
 ];
@@ -121,7 +123,7 @@ export function WalletStateScreen(): React.ReactElement {
     fiatPerBchRate,
     formattedFiatPerBchRate,
     formatSatoshisToFiat,
-  } = useSatoshisConversion('USD');
+  } = useSatoshisConversion();
 
   // State
   const [balance, setBalance] = useState<{ totalSatoshis: bigint; utxoCount: number } | null>(null);
@@ -133,6 +135,14 @@ export function WalletStateScreen(): React.ReactElement {
 
   /** Cash address to display in the QR code dialog (null when dialog is hidden). */
   const [qrAddress, setQrAddress] = useState<string | null>(null);
+  /** Whether the fiat currency selection dialog is open. */
+  const [isCurrencyDialogOpen, setCurrencyDialogOpen] = useState(false);
+  /** Loading state for rates pair discovery. */
+  const [isLoadingCurrencyPairs, setLoadingCurrencyPairs] = useState(false);
+  /** Optional error message shown in the currency dialog. */
+  const [currencyPairsError, setCurrencyPairsError] = useState<string | null>(null);
+  /** Available fiat currencies derived from rates pairs in X/BCH format. */
+  const [availableCurrencies, setAvailableCurrencies] = useState<string[]>([]);
 
   /**
    * Refreshes wallet state.
@@ -260,6 +270,89 @@ export function WalletStateScreen(): React.ReactElement {
     }
   }, [appService, setStatus, showError, showInfo, refresh]);
 
+  /**
+   * Loads all available rates pairs, then extracts fiat numerator symbols from
+   * pairs shaped like X/BCH.
+   *
+   * We retry briefly because rates startup is asynchronous and metadata can take
+   * a moment to hydrate right after wallet initialization.
+   */
+  const loadAvailableCurrencies = useCallback(async (): Promise<void> => {
+    if (!appService) {
+      setCurrencyPairsError("AppService not initialized");
+      return;
+    }
+
+    setLoadingCurrencyPairs(true);
+    setCurrencyPairsError(null);
+
+    try {
+      let pairs = new Set<string>();
+
+      // Retry a few times so we can catch late metadata initialization.
+      for (let attempt = 0; attempt < 4; attempt += 1) {
+        pairs = await appService.rates.listPairs();
+        if (pairs.size > 0) {
+          break;
+        }
+        await new Promise((resolve) => setTimeout(resolve, 200));
+      }
+
+      const currencies = Array.from(pairs)
+        .map((pair) => pair.toUpperCase())
+        .filter((pair) => pair.endsWith("/BCH"))
+        .map((pair) => pair.split("/")[0] ?? "")
+        .filter((currency) => currency.length > 0)
+        .sort((a, b) => a.localeCompare(b));
+
+      const uniqueCurrencies = Array.from(new Set(currencies));
+      setAvailableCurrencies(uniqueCurrencies);
+
+      if (uniqueCurrencies.length === 0) {
+        setCurrencyPairsError(
+          "No X/BCH rates are currently available. Try again in a moment.",
+        );
+      }
+    } catch (error) {
+      setCurrencyPairsError(
+        `Failed to load currency pairs: ${error instanceof Error ? error.message : String(error)}`,
+      );
+    } finally {
+      setLoadingCurrencyPairs(false);
+    }
+  }, [appService]);
+
+  /**
+   * Opens the fiat currency dialog and triggers pair discovery.
+   */
+  const openCurrencyDialog = useCallback(() => {
+    setCurrencyDialogOpen(true);
+    void loadAvailableCurrencies();
+  }, [loadAvailableCurrencies]);
+
+  /**
+   * Applies the selected fiat currency to persisted settings.
+   */
+  const applyCurrencySelection = useCallback(
+    (currencyCode: string) => {
+      if (!appService) {
+        showError("AppService not initialized");
+        return;
+      }
+
+      try {
+        appService.settings.setCurrency(currencyCode);
+        setStatus(`Fiat currency updated to ${currencyCode}`);
+        setCurrencyDialogOpen(false);
+      } catch (error) {
+        showError(
+          `Failed to update currency: ${error instanceof Error ? error.message : String(error)}`,
+        );
+      }
+    },
+    [appService, setStatus, showError],
+  );
+
   /**
    * Handles menu action.
    */
@@ -277,6 +370,9 @@ export function WalletStateScreen(): React.ReactElement {
       case 'new-address':
         generateNewAddress();
         break;
+      case 'set-currency':
+        openCurrencyDialog();
+        break;
       case 'unreserve-all':
         unreserveAll();
         break;
@@ -284,7 +380,7 @@ export function WalletStateScreen(): React.ReactElement {
         refresh();
         break;
     }
-  }, [navigate, generateNewAddress, unreserveAll, refresh]);
+  }, [navigate, generateNewAddress, openCurrencyDialog, unreserveAll, refresh]);
 
   /**
    * Handle menu item activation.
@@ -543,6 +639,27 @@ export function WalletStateScreen(): React.ReactElement {
           onClose={() => setQrAddress(null)}
         />
       )}
+
+      {/* Fiat currency selection dialog overlay */}
+      {isCurrencyDialogOpen && (
+        <Box
+          position="absolute"
+          flexDirection="column"
+          alignItems="center"
+          justifyContent="center"
+          width="100%"
+          height="100%"
+        >
+          <CurrencySelectionDialog
+            currentCurrency={currencyCode}
+            currencies={availableCurrencies}
+            isLoading={isLoadingCurrencyPairs}
+            errorMessage={currencyPairsError}
+            onSelectCurrency={applyCurrencySelection}
+            onCancel={() => setCurrencyDialogOpen(false)}
+          />
+        </Box>
+      )}
     </Box>
   );
 }

src/tui/screens/action-wizard/steps/InputsStep.tsx

@@ -23,7 +23,7 @@ export function InputsStep({
   changeAmount,
   focusArea,
 }: Props): React.ReactElement {
-  const { formatSatoshisToFiat } = useSatoshisConversion('USD');
+  const { formatSatoshisToFiat } = useSatoshisConversion();
 
   const getFiatSuffix = (satoshis: bigint): string => {
     const fiatValue = formatSatoshisToFiat(satoshis);

src/tui/screens/action-wizard/steps/ReviewStep.tsx

@@ -23,7 +23,7 @@ export function ReviewStep({
   changeAmount,
 }: ReviewStepProps): React.ReactElement {
   const selectedUtxos = availableUtxos.filter((u) => u.selected);
-  const { formatSatoshisToFiat } = useSatoshisConversion('USD');
+  const { formatSatoshisToFiat } = useSatoshisConversion();
 
   const getFiatSuffix = (satoshis: bigint): string => {
     const fiatValue = formatSatoshisToFiat(satoshis);

src/tui/screens/invitations/InvitationScreen.tsx

@@ -113,7 +113,7 @@ export function InvitationScreen(): React.ReactElement {
 
   const invitations = useInvitations();
   const { currencyCode, formattedFiatPerBchRate, formatSatoshisToFiat } =
-    useSatoshisConversion('USD');
+    useSatoshisConversion();
 
   // ── UI state ─────────────────────────────────────────────────────────────
   const [selectedIndex, setSelectedIndex] = useState(0);

src/tui/screens/invitations/invitation-import/steps/InputsSelectStep.tsx

@@ -33,7 +33,7 @@ export function InputsSelectStep({
   const [requiredAmount, setRequiredAmount] = useState(0n);
   const [isLoading, setIsLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  const { formatSatoshisToFiat } = useSatoshisConversion('USD');
+  const { formatSatoshisToFiat } = useSatoshisConversion();
 
   const fee = DEFAULT_FEE;
 

src/tui/screens/invitations/invitation-import/steps/PreviewInvitationStep.tsx

@@ -42,7 +42,7 @@ export function PreviewInvitationStep({
   onCancel,
   isActive,
 }: PreviewStepProps): React.ReactElement {
-  const { formatSatoshisToFiat } = useSatoshisConversion('USD');
+  const { formatSatoshisToFiat } = useSatoshisConversion();
 
   useLayeredInput('import-flow', (_input, key) => {
     if (key.return) onComplete();

src/tui/screens/invitations/invitation-import/steps/ReviewStep.tsx

@@ -33,7 +33,7 @@ export function ReviewStep({
 }: ReviewStepProps): React.ReactElement {
   const [isSubmitting, setIsSubmitting] = useState(false);
   const [error, setError] = useState<string | null>(null);
-  const { formatSatoshisToFiat } = useSatoshisConversion('USD');
+  const { formatSatoshisToFiat } = useSatoshisConversion();
 
   const fee = DEFAULT_FEE;
   const action = template?.actions?.[invitation.data.actionIdentifier];