Redesign panels, add 11 card fixes, new icons and app surfaces

Panel fixes: tall card row_span, room tab styling, vacuum card
image+value, AC airflow labels, AC fan speed sections (auto 3-btn
+ manual 5-step slider), light subtitle fallback, curtain pane
dividers, dimmable light presets, LED panel brightness + reorder.

New assets: 34 ui-icons (climate modes, cover, effects, battery,
led-strip, switch states), 3 logos, 90 app surface PNGs, design
system specs (components, ux-mechanics, tokens).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

assets/ui-icons/cover.svg

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truncated