- Extract route paths to router/routes.ts as single source of truth
- Refactor connect.ts auth interceptor with better structure and error handling
  - Add TokenRefreshManager class to prevent race conditions
  - Implement smart redirect logic for public/private routes
  - Support unauthenticated access to explore and user profile pages
  - Add proper error handling for missing access tokens
  - Extract magic strings to named constants
- Maintain backward compatibility by aliasing Routes to ROUTES

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>