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/src-tauri/src/intelligence/compactor.rs

@@ -109,7 +109,7 @@ pub fn estimate_tokens(text: &str) -> usize {
         return 0;
     }
 
-    let mut tokens = 0.0;
+    let mut tokens: f64 = 0.0;
     for char in text.chars() {
         let code = char as u32;
         if code >= 0x4E00 && code <= 0x9FFF {