- Add api-fallbacks.ts with structured fallback data for 6 missing API endpoints
- QuickConfig, WorkspaceInfo, UsageStats, PluginStatus, ScheduledTasks, SecurityStatus
- Graceful degradation when backend returns 404
- Add heartbeat mechanism (30s interval, 3 max missed)
- Automatic connection keep-alive with ping/pong
- Triggers reconnect when heartbeats fail
- Improve reconnection strategy
- Emit 'reconnecting' events for UI feedback
- Support infinite reconnect mode
- Add ConnectionStatus component
- Visual indicators for 5 connection states
- Manual reconnect button when disconnected
- Compact and full display modes
Diagnosed via Chrome DevTools: WebSocket was working fine, real issue was
404 errors from missing API endpoints being mistaken for connection problems.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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