James L 7b71181378 v1.0.17: flash.py - app detection + clean flash flow ...

- Add check_app_on_device(): reads 256 bytes from APP_ADDR (0x10000),
  if all 0xFF (blank flash) forces full flash automatically
- Restructure flash decision flow:
  1. Detect board (reboot + flash_id)
  2. Check if app exists on device -> no app = full flash
  3. Check partition table matches -> mismatch = full flash
  4. Ask 'Erase flash before writing?' -> Y = full flash
  5. Full flash: merged binary at 0x0000
  6. Normal update: extract app from merged, flash at 0x10000
- Remove old confusing erase/partition prompts
- Settings (NVS/EEPROM) preserved on normal updates, never accidentally wiped

2026-02-28 16:12:02 -05:00

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