Fix: Resolve four extension wallet issues

[Hahfyeex]

🐛 Issues Fixed

#1393 - Live /home route displays hardcoded fake balance

Problem: The router's inline HomeScreen() component rendered a hardcoded 1,245.80 XLM balance, while the real HomeScreen.tsx with proper balance fetching via useAccountBalance (fixed in #1228/#1286) was never imported or used.

Solution: Imported and used the real HomeScreen component that properly fetches live balances from the network.

Files changed:

• apps/extension-wallet/src/router/index.tsx

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#1396 - PermissionSelector.tsx is unused duplicate code

Problem: A reusable PermissionSelector component built on @ancore/account-abstraction's bitmask helpers existed but was never imported. Instead, AddSessionKeyDialog.tsx hand-rolled its own hardcoded permission array with duplicate logic.

Solution: Refactored AddSessionKeyDialog to use the existing PermissionSelector component, eliminating code duplication and ensuring consistency with the canonical permission system.

Files changed:

• apps/extension-wallet/src/screens/SessionKeys/AddSessionKeyDialog.tsx

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#1394 - SessionKeysFlow.tsx is fully dead code

Problem: A 133-line component file (SessionKeysFlow.tsx) with its own local types had zero importers across the entire codebase. The router uses the separate SessionKeysScreen.tsx instead.

Solution: Deleted the unused file to reduce maintenance burden and codebase complexity.

Files changed:

• apps/extension-wallet/src/screens/SessionKeys/SessionKeysFlow.tsx (deleted)

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#1397 - signAuthEntry returns bare signature, not full signed entry XDR

Problem: The signAuthEntry function's JSDoc promised to return "the full signed entry XDR" but the implementation discarded the decoded entry and returned only raw signature bytes as base64. This violated SEP-43 expectations and had a TODO(#770) acknowledging the gap.

Solution: Implemented proper XDR construction:

• Create SorobanAddressCredentials with the signature
• Build a complete SorobanAuthorizationEntry with embedded credentials
• Return the full signed entry XDR as documented

Files changed:

• apps/extension-wallet/src/background/handlers/sign-auth-entry.ts

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📊 Impact

• Code deletion: -238 lines (removed dead code)
• Code quality: Eliminated duplicate implementations and aligned code with documentation
• Functionality: Fixed hardcoded balance display and incorrect XDR return value
• Maintainability: Reduced technical debt by removing unused files and consolidating duplicate logic

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✅ Testing

• Verify /home route displays real account balance (not hardcoded 1,245.80 XLM)
• Test session key creation dialog uses proper permission selector
• Confirm signAuthEntry returns valid SorobanAuthorizationEntry XDR
• Ensure no regressions in session key functionality

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Closes #1393
Closes #1394
Closes #1396
Closes #1397

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