fix: auto-center map on user's location instead of Hamburg

Trigger GeolocateControl on map load so the map flies to the user's
position. Default viewport changed from Hamburg CCH zoom-15 to a
world view, so denied geolocation still looks reasonable.

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

src/components/map/MapView.tsx

@@ -37,10 +37,10 @@ interface MapViewProps {
   onClearRoute?: () => void;
 }
 
-// Default to Hamburg CCH area for CCC events
+// Default viewport — geolocation will override on load
 const DEFAULT_VIEWPORT: MapViewport = {
-  center: [9.9898, 53.5550], // Hamburg CCH
-  zoom: 15,
+  center: [0, 30], // World view; geolocation re-centers automatically
+  zoom: 2,
 };
 
 // Validate coordinates are within valid ranges
@@ -147,16 +147,14 @@ export default function MapView({
 
     // Add controls
     map.current.addControl(new maplibregl.NavigationControl(), 'top-right');
-    map.current.addControl(
-      new maplibregl.GeolocateControl({
-        positionOptions: {
-          enableHighAccuracy: true,
-        },
-        trackUserLocation: true,
-        showUserHeading: true,
-      } as maplibregl.GeolocateControlOptions),
-      'top-right'
-    );
+    const geolocate = new maplibregl.GeolocateControl({
+      positionOptions: {
+        enableHighAccuracy: true,
+      },
+      trackUserLocation: true,
+      showUserHeading: true,
+    } as maplibregl.GeolocateControlOptions);
+    map.current.addControl(geolocate, 'top-right');
     map.current.addControl(new maplibregl.ScaleControl(), 'bottom-left');
 
     // Handle click events
@@ -166,6 +164,8 @@ export default function MapView({
 
     map.current.on('load', () => {
       setMapLoaded(true);
+      // Auto-trigger geolocation to center on user's position
+      geolocate.trigger();
     });
 
     return () => {