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/sw.js

@@ -4,7 +4,7 @@ self.addEventListener('message', event => {
   if (event.data === 'skipWaiting') self.skipWaiting();
 });
 
-const CACHE = 'weather-v5';
+const CACHE = 'weather-v7';
 
 // App shell cached on install for offline resilience.
 const PRECACHE = [
@@ -31,6 +31,37 @@ self.addEventListener('activate', event => {
   );
 });
 
+self.addEventListener('push', event => {
+  if (!event.data) return;
+  let payload;
+  try { payload = event.data.json(); } catch { payload = { title: 'NeCloud Weather', body: event.data.text() }; }
+  event.waitUntil(
+    self.registration.showNotification(payload.title || 'NeCloud Weather', {
+      body: payload.body || '',
+      icon: '/icons/icon-192.png',
+      badge: '/icons/icon-192.png',
+      tag: payload.tag || 'weather-alert',
+      data: { url: payload.url || '/' },
+    })
+  );
+});
+
+self.addEventListener('notificationclick', event => {
+  event.notification.close();
+  const url = event.notification.data?.url || '/';
+  event.waitUntil(
+    clients.matchAll({ type: 'window', includeUncontrolled: true }).then(wins => {
+      for (const w of wins) {
+        if (w.url.startsWith(self.registration.scope) && 'focus' in w) {
+          w.navigate(url);
+          return w.focus();
+        }
+      }
+      return clients.openWindow(url);
+    })
+  );
+});
+
 self.addEventListener('fetch', event => {
   const { request } = event;
   const url = new URL(request.url);