Critical fixes:
- Translation proxy now uses system Node.js (not Electron binary)
- Removed duplicate proxy start causing port conflicts
- Added port availability check before spawning proxy
- Fixed welcome:choice double resolve()
- Fixed settings.html close using deprecated remote
- Fixed translationProxy /v1 for openai-compat backends
- Proxy no longer detached/unref - properly tracked as child
- SingletonLock cleanup on startup
Verified E2E:
- Welcome screen on first run ✓
- Provider selection works ✓
- Settings save + sync ✓
- Translation proxy starts correctly ✓
- LS connects to proxy ✓
- --ag-reset works ✓
Features:
- Welcome screen on first run (provider choice before LS starts)
- 15+ AI providers (Google Gemini, OpenAI, Anthropic, DeepSeek, Ollama, etc.)
- Provider config syncs to endpoints.json for translation proxy
- Built-in Node.js translation proxy for non-native backends
- Auto-update support, tray integration, URI scheme handler
