- Fix integer underflow panic in LED color publisher by adding bounds checking
- Reduce screenshot capture frequency from 15 FPS to 5 FPS for better CPU performance
- Reduce WebSocket force-send frequency from 200ms to 500ms
- Fix WebSocket resource leak by properly cleaning up streams when connections end
- Add proper stream lifecycle management with is_running flag checks
- Ensure background tasks exit when streams are stopped
This resolves the issue where CPU usage remained above 100% after visiting
the LED strip configuration page, even when navigating to other pages.