Fix charging wake recovery

[skialpine]

Summary

• Handle combined EXT1 wake bitmasks so button wake intent wins over charging wake
• Let the charging screen return to scale mode when USB is unplugged instead of going back to sleep
• Recover the ADS1232 in the main scale loop if samples stop arriving after wake/charge state changes

Context

This targets a hang seen after charging completes: the scale wakes from a charger-related state, but the ADC can remain silent and weight updates stop until the battery connector is physically replugged.

Validation

• platformio run
• Also tested the combined local firmware on an attached ESP32-S3 with platformio run -t upload --upload-port /dev/cu.wchusbserial110; flash verification completed successfully.