Upgrade maps to MapLibre GL JS; compact header; move search to settings

- Replace Leaflet with MapLibre GL JS v4.7.1 across all map instances
- CARTO dark/light and Esri satellite raster basemaps (no API key)
- All overlays (hurricane, wildfire, SPC, wind arrows) ported to GeoJSON sources/layers
- AQI, alert, temp, sun/moon markers via maplibregl.Marker with custom HTML
- Radar animation pre-loads all frames on load for smoother playback
- Compact loc-header: tighter padding and font sizes, all info preserved
- Search bar moved from header to Settings tab under Location section
- Service worker bumped to weather-v7

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

app/public/manifest.json

@@ -5,8 +5,9 @@
   "start_url": "/",
   "scope": "/",
   "display": "standalone",
+  "display_override": ["window-controls-overlay", "standalone"],
   "background_color": "#191510",
-  "theme_color": "#1a1a1a",
+  "theme_color": "#191510",
   "orientation": "portrait-primary",
   "categories": ["weather", "utilities"],
   "icons": [
@@ -28,5 +29,33 @@
       "type": "image/svg+xml",
       "purpose": "any"
     }
+  ],
+  "share_target": {
+    "action": "/?share",
+    "method": "GET",
+    "params": { "title": "title", "text": "text", "url": "url" }
+  },
+  "shortcuts": [
+    {
+      "name": "Current Conditions",
+      "short_name": "Now",
+      "description": "View current weather and forecast",
+      "url": "/?tab=conditions",
+      "icons": [{ "src": "/icons/icon-192.png", "sizes": "192x192" }]
+    },
+    {
+      "name": "Radar Map",
+      "short_name": "Map",
+      "description": "Live radar and weather map",
+      "url": "/?tab=unified-map",
+      "icons": [{ "src": "/icons/icon-192.png", "sizes": "192x192" }]
+    },
+    {
+      "name": "Active Alerts",
+      "short_name": "Alerts",
+      "description": "Weather warnings and alerts",
+      "url": "/?tab=alerts",
+      "icons": [{ "src": "/icons/icon-192.png", "sizes": "192x192" }]
+    }
   ]
 }