feat: complete Phase 1-3 architecture optimization

Phase 1 - Security:
- Add AES-GCM encryption for localStorage fallback
- Enforce WSS protocol for non-localhost WebSocket connections
- Add URL sanitization to prevent XSS in markdown links

Phase 2 - Domain Reorganization:
- Create Intelligence Domain with Valtio store and caching
- Add unified intelligence-client for Rust backend integration
- Migrate from legacy agent-memory, heartbeat, reflection modules

Phase 3 - Core Optimization:
- Add virtual scrolling for ChatArea with react-window
- Implement LRU cache with TTL for intelligence operations
- Add message virtualization utilities

Additional:
- Add OpenFang compatibility test suite
- Update E2E test fixtures
- Add audit logging infrastructure
- Update project documentation and plans

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/tests/lib/request-helper.test.ts

@@ -66,8 +66,8 @@ describe('request-helper', () => {
       const timeoutError = new RequestError('timeout', 408, 'Request Timeout');
       expect(timeoutError.isTimeout()).toBe(true);
 
-      const const otherError = new RequestError('other', 500, 'Error');
-      expect(otherError.isTimeout()).toBe(false);
+      const otherError2 = new RequestError('other', 500, 'Error');
+      expect(otherError2.isTimeout()).toBe(false);
     });
 
     it('should detect auth errors', () => {