Fix shifted pictures: non-blocking Nano drawing, frame check, refresh settings
The Nano's periodic full redraw blocked for ~0.8 s. A frame that arrived meanwhile overflowed its 64-byte serial buffer; lost bytes in a bitmap shift the rest of the image (picture moved up), and diff frames never repaired it. - Nano: all drawing (frames, effects, the dot refresh) runs from update() in ~1 ms slices; the refresh pauses while a frame is received or shown - New commands: C (reply with the image checksum) and I (refresh minutes, EEPROM) - ESP32: NanoMonitor asks for the checksum after frames and sends the whole image again on a mismatch, missing answer or Nano restart; counts ERR replies. Periodic whole-image resync. - Settings: "Dot refresh" and "Image resync" intervals (settings v5, v4 records are migrated) - System tab: loop timing, free memory, frame check counts - test_driver: the real driver against a simulated panel Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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