- Convert all Serial.println/printf debug logging to ESP_LOGE/W/I/D
- Add TAG-based log identification (server/client)
- Lower CORE_DEBUG_LEVEL from 5 to 3 for production
- Keep Serial.printf for USB serial protocol commands (KEY?, VERSION?, etc.)
- MainActivity: remove isServer check — relay buttons always enabled when
connected, regardless of device mode (fixes silently broken buttons when
device mode accidentally set to 'client')
- client.cpp: invert HS-S43A touch sensor readings (!tActive) — sensors
are active LOW
- build.gradle: bump versionCode 2, versionName 1.1
- platformio.ini: use stable by-id port for server ESP32
- firmware/*.bin: rebuilt with LED signaling and touch fixes
- Firmware: add VERSION? command returning BUILD_NR for version check
- Android: flash button checks firmware version first, skips flash if current
- After flash: auto key exchange via reboot detection (expectingReboot flag)
- device_filter.xml + intent-filter: USB permission 'always allow' checkbox
- singleTop + onNewIntent prevents unwanted SettingsActivity launch on USB connect
- platformio.ini: upload_port updated to /dev/ttyACM1
