fix: Weather widget positioning and z-index

- Position at 64px from top (desktop & mobile)
- z-index 830 (above FAB, below searchbar dropdown)
- Throttle map updates to 2 seconds
- Click outside to close expanded view

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/apps/AppOverlay.css

@@ -9,7 +9,7 @@
   right: 0;
   bottom: 0;
   pointer-events: none;
-  z-index: 500;
+  z-index: 830; /* Above FAB (820) but below searchbar dropdown (850) */
   overflow: hidden;
 }
 
@@ -24,7 +24,7 @@
 }
 
 .app-slot-top-left {
-  top: 78px; /* Below search bar */
+  top: 64px; /* Below search bar */
   left: 13px;
   align-items: flex-start;
 }
@@ -157,7 +157,7 @@
 @media (max-width: 640px) {
   .app-slot-top-left,
   .app-slot-top-right {
-    top: 60px;
+    top: 64px;
   }
 
   .app-slot-bottom-left,

src/apps/weather/WeatherWidget.jsx

@@ -144,7 +144,7 @@ export default function WeatherWidget({ appInstanceId, appHost, config = {} }) {
     if (!context || context.sectorId === lastSectorId) return;
 
     const now = Date.now();
-    if (now - lastRequestTimeRef.current < 1000) return; // Throttle: 1 second min
+    if (now - lastRequestTimeRef.current < 2000) return; // Throttle: 2 seconds min
 
     setLastSectorId(context.sectorId);
     lastRequestTimeRef.current = now;