feat(update): implement auto-update functionality with electron-updater

- Add AppUpdater module with update lifecycle management
- Create UpdateSettings UI component with progress display
- Add Progress UI component based on Radix UI
- Create update Zustand store for state management
- Register update IPC handlers in main process
- Auto-check for updates on production startup
- Add commit documentation for commits 2-6

build_process/process.md

@@ -11,6 +11,7 @@
 * [commit_3] Setup wizard - Multi-step onboarding flow with provider, channel, skill selection
 * [commit_4] Provider configuration - Secure API key storage, provider management UI
 * [commit_5] Channel connection flows - Multi-channel support with QR/token connection UI
+* [commit_6] Auto-update functionality - electron-updater integration with UI
 
 ### Plan:
 1. ~~Initialize project structure~~ ✅
@@ -18,7 +19,7 @@
 3. ~~Implement Setup wizard with actual functionality~~ ✅
 4. ~~Add Provider configuration (API Key management)~~ ✅
 5. ~~Implement Channel connection flows~~ ✅
-6. Add auto-update functionality
+6. ~~Add auto-update functionality~~ ✅
 7. Packaging and distribution setup
 
 ## Version Milestones