Landscape kiosk overhaul: 3-column layout, resilient updates, visual polish

- Add 3-column balanced site distribution using greedy weight algorithm
- Build new DOM off-screen in DocumentFragment, swap atomically (no flash)
- Skip empty API responses and preserve display on transient errors
- Remove news ticker from UI and grid layout
- Add blue-to-red gradient on site header bars
- Bump font sizes: destinations 1.4em, countdowns 1.5em, line numbers 1.6em
- Add breathing pulse animation on daylight bar sun/moon icons
- Fix daylight bar indicator snapping to position on first render
- Make config button visible in landscape with semi-transparent background
- Add weather forecast strip as grid row 4 with compact styling

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

public/js/main.js

@@ -78,8 +78,7 @@ document.addEventListener('DOMContentLoaded', async function() {
             lastUpdatedId: 'last-updated'
         });
 
-        // Initialize NewsTicker (visible in landscape mode only via CSS)
-        window.newsTicker = new NewsTicker();
+        // NewsTicker disabled - ticker removed from UI
 
         // Set up event listeners
         document.addEventListener('darkModeChanged', event => {