Merge dev to main - UI improvements & code cleanup

[chriswritescode-dev]

Summary

• Fix TypeScript optional chaining in git error utilities
• Remove outdated code review documentation
• Improve STT response time with audio recorder optimizations
• Fix repo navigation when download dialog closes

Changes

• backend/src/utils/git-errors.ts: Use optional chaining operators for cleaner code
• code-review/backend-routes.md: Remove obsolete code review documentation file
• frontend/src/hooks/useSTT.ts: Optimize STT response handling
• frontend/src/lib/audioRecorder.ts: Add audio recording improvements
• frontend/src/components/repo/RepoCard.tsx: Fix navigation issue on dialog close

Files Changed

• 2 files modified in backend
• 3 files modified in frontend
• 358 lines removed, 29 lines added

Testing

All changes have been validated and ready for merge to main branch.