- Split 1212-line monolithic file into 6 modular files
- Extracted types, dialogs, list view into separate modules
- Main index.tsx (468 lines) handles state management and API integration
- All CRUD operations, stats, review, search, pagination preserved
- Build passes with zero TypeScript errors (3.77s)
- Migrated all 11 functions in expression-api.ts to return Promise<ApiResponse<T>>
- Implemented manual response handling following person-api pattern
- Properly unwrap nested API responses and re-wrap in ApiResponse
- Updated all 16 call sites across 4 files with proper error handling
- Fixed type annotations (ChatInfo) in expression.tsx
- Build passes successfully with no TypeScript errors
- Follows AGENTS.md import conventions and Wave 2 constraints
- All HTTP and API-level errors handled consistently via ApiResponse