Update to latest engine. Add sync-v2. Various fixes.

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

@@ -14,9 +14,6 @@ import { useSatoshisConversion } from '../../../../hooks/useSatoshisConversion.j
 import { useLayeredInput } from '../../../../hooks/useInputLayer.js';
 import type { ReviewStepProps, SelectableUTXO } from '../types.js';
 
-/** Default fee estimate in satoshis. */
-const DEFAULT_FEE = 500n;
-
 /** Dust threshold — outputs below this are unspendable. */
 const DUST_THRESHOLD = 546n;
 
@@ -27,6 +24,7 @@ export function ReviewStep({
   selectedInputs,
   requiredAmount,
   changeAmount,
+  fee,
   onComplete,
   onCancel,
   isActive,
@@ -35,7 +33,6 @@ export function ReviewStep({
   const [error, setError] = useState<string | null>(null);
   const { formatSatoshisToFiat } = useSatoshisConversion();
 
-  const fee = DEFAULT_FEE;
   const action = template?.actions?.[invitation.data.actionIdentifier];
 
   // Compute totals from selected inputs