Adds a full-screen overlay when the daemon disconnects with:
- Real-time connection status indicator in top-right
- Explanation of what the daemon is and why it's required
- Restart button with background mode checkbox
- CLI commands reference panel with copy buttons
- Automatic app reload when daemon reconnects
The overlay uses reactive status polling and event-based detection to ensure accurate connection state tracking. When the daemon comes back online, the app automatically reloads to sync state.
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