feat: complete stage 4 cleanup and code formatting
This commit completes stage 4 of the refactoring plan, focusing on cleanup
and optimization of the modernized codebase.
## Key Changes
### Code Cleanup
- Remove legacy `src/lib/styles.ts` (no longer needed)
- Remove old modal components (`ImportProgressModal.tsx`, `ProviderList.tsx`)
- Streamline `src/lib/tauri-api.ts` from 712 lines to 17 lines (-97.6%)
- Remove global `window.api` pollution
- Keep only event listeners (`tauriEvents.onProviderSwitched`)
- All API calls now use modular `@/lib/api/*` layer
### Type System
- Clean up `src/vite-env.d.ts` (remove 156 lines of outdated types)
- Remove obsolete global type declarations
- All TypeScript checks pass with zero errors
### Code Formatting
- Format all source files with Prettier (82 files)
- Fix formatting issues in 15 files:
- App.tsx and core components
- MCP management components
- Settings module components
- Provider management components
- UI components
### Documentation Updates
- Update `REFACTORING_CHECKLIST.md` with stage 4 progress
- Mark completed tasks in `REFACTORING_MASTER_PLAN.md`
## Impact
**Code Reduction:**
- Total: -1,753 lines, +384 lines (net -1,369 lines)
- tauri-api.ts: 712 → 17 lines (-97.6%)
- Removed styles.ts: -82 lines
- Removed vite-env.d.ts declarations: -156 lines
**Quality Improvements:**
- ✅ Zero TypeScript errors
- ✅ Zero TODO/FIXME comments
- ✅ 100% Prettier compliant
- ✅ Zero `window.api` references
- ✅ Fully modular API layer
## Testing
- [x] TypeScript compilation passes
- [x] Code formatting validated
- [x] No linting errors
Stage 4 completion: 100%
Ready for stage 5 (testing and bug fixes)
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