Veilleuse 3.1.0

Keyboard sliders

• ←/→ now adjust the slider the cursor is on (brightness +1, temperature +50 K, gamma +1) instead of switching views, matching the pointer behavior.
• Outside the sliders, ←/→ still switch between the Home, Automation, and Settings views.
• Keyboard hints updated in English and Spanish.

Housekeeping

• Removed the legacy v1 Model.js and its test suite; the panel only ships UiModel.js.
• Removed the redundant uiModelV2 test file — its unique cases moved into UiModel.test.js.
• Marketplace preview restored as preview.png.