- Add ESP.wdtFeed() and yield() calls during OTA flash writes
- Reduce OTA buffer size from 1024 to 512 bytes for ESP8266
- Add heap memory check before starting OTA download
- Reduce BearSSL buffer sizes during OTA
- Defer logger saveToFile() to main loop instead of blocking in callbacks
- Add needsUrgentSave() for ERROR/WARN log handling
- Add strategic yield() calls in main loop for better CPU sharing
- Optimize LED controller to only call FastLED.show() when color changes