New "Steuerung" page for tablet control:
- Large touch tiles for every light/switch — tap toggles (through
DeviceCommandService), highlighted when on, live via Echo.
- Drag-to-reorder via SortableJS (handle per tile); order persisted to
entities.panel_sort.
- Lights get a colour/brightness modal → Light.Set (brightness + rgb) on the
Shelly, with preset swatches + a custom colour picker. Driver contract gains
setLight(); command service audits it (H1).
Nav check 11/11 tabs clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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