SpaceCadet mode not saved: UI toggle OFF does not write mode=2 to EEPROM (stays at mode=1)

[artkpv]

Summary

The "Enable SpaceCadet shifts" toggle in Preferences → My Keyboard appears to work in the UI, but toggling it OFF and clicking Save Changes does not write spacecadet.mode 2 (disabled) to the keyboard EEPROM. The value remains 1 (NO_MINIMUM).

Steps to reproduce

1. Connect Keyboardio Atreus
2. Open Chrysalis (web: chrysalis.keyboard.io)
3. Go to Preferences → My Keyboard
4. Under SpaceCadet, toggle "Enable SpaceCadet shifts" OFF
5. Click Save Changes
6. Export layout backup (Backup and Restore → Export)
7. Inspect the exported JSON: deviceConfiguration["spacecadet.mode"] is still 1

Expected behavior

After toggling OFF and saving, spacecadet.mode should be 2 (disabled).

Actual behavior

spacecadet.mode remains 1 (NO_MINIMUM — SpaceCadet is still active).

This was reproduced across:

• 3 separate save attempts with the same firmware
• A firmware update (0.93.0+128 → 0.94.0+132) followed by another save attempt
• Each time the exported JSON confirms mode=1

Impact

SpaceCadet mode=1 intercepts modifier-only chords (e.g. Alt+Shift for OS language switching), causing it to work inconsistently depending on keystroke timing. Users have no way to disable SpaceCadet via the UI.

Environment

• Chrysalis version: 2025.0909.0307 (web app at chrysalis.keyboard.io)
• Keyboard: Keyboardio Atreus
• Firmware version: 0.94.0+132
• OS: Linux (Arch)