v2.5.3 - Hash Authentication Bug Fix + Codebase Audit

Critical Fix:
- Register page now stores hash in valid hashes immediately upon generation
- Users can copy hash and login without clicking 'Continue' button
- Resolves 'Invalid hash' error when copying from register page

Improvements:
- Enhanced debug logging in auth store for troubleshooting
- Created shared auth helper utilities (auth-helpers.ts)
- Comprehensive audit of 35+ TODOs/stubs (TODOS_AND_STUBS_AUDIT.md)

Documentation:
- Full codebase audit with priority ranking (HIGH/MEDIUM/LOW)
- Implementation plan for fixing authentication stubs
- Quick wins and recommended next steps identified

Next Steps:
- Phase 1: Consolidate API authentication (18 files to update)
- Phase 2: Add missing API keys and configurations
- Phase 3: Complete workspace management features