Kiosk UI/UX overhaul: dark landscape mode with hero countdowns and full-width layout

Redesign the landscape orientation for kiosk readability at 3-10m distance:

- Add dark kiosk background (#1a1a2e) with high-contrast light text
- Replace 2-column grid with 5-row full-width stacking layout
- Add compact weather bar (temp + sunrise/sunset) replacing full widget
- Enlarge countdown to 2em hero size in landscape
- Replace time ranges with next 2-3 absolute departure times
- Add 3-tier urgency colors: Nu (green), 1-2min (red), 3-5min (orange)
- Make site headers full-width blue gradient bars in landscape
- Tighten card spacing (65px min-height, 8px gap) for 4-stop visibility
- Add scrolling news ticker with /api/ticker fallback messages
- Fix daylight bar from position:fixed to relative in landscape grid
- Hide background overlay in landscape for maximum contrast
- Fix weather-section HTML missing closing div tags

All changes scoped behind body.landscape CSS selectors; other orientations unaffected.

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

config/sites.json

@@ -1,5 +1,5 @@
 {
-  "orientation": "normal",
+  "orientation": "landscape",
   "darkMode": "auto",
   "backgroundImage": "https://images.unsplash.com/photo-1509356843151-3e7d96241e11?q=80&w=1000",
   "backgroundOpacity": 0.45,