feat: Zoom to location instead of opening Google Maps

Replace all Google Maps navigation links with in-app zoom functionality.
When clicking on a participant or waypoint to navigate, the map now
smoothly flies to their location at zoom level 17 instead of opening
an external Google Maps link.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/app/[slug]/page.tsx

@@ -37,6 +37,7 @@ export default function RoomPage() {
   const [selectedParticipant, setSelectedParticipant] = useState<Participant | null>(null);
   const [selectedWaypoint, setSelectedWaypoint] = useState<Waypoint | null>(null);
   const [shouldAutoStartSharing, setShouldAutoStartSharing] = useState(false);
+  const [zoomToLocation, setZoomToLocation] = useState<{ latitude: number; longitude: number } | null>(null);
 
   // Load user and sharing preference from localStorage
   useEffect(() => {
@@ -263,17 +264,16 @@ export default function RoomPage() {
     };
   }, [leave]);
 
-  // Navigate to participant - opens Google Maps navigation
+  // Navigate to participant - zoom to their location on the map
   const handleNavigateTo = (participant: Participant) => {
     if (!participant.location) {
       console.log('No location for participant:', participant.name);
       return;
     }
     const { latitude, longitude } = participant.location;
-    window.open(
-      `https://www.google.com/maps/dir/?api=1&destination=${latitude},${longitude}`,
-      '_blank'
-    );
+    setZoomToLocation({ latitude, longitude });
+    setSelectedParticipant(participant);
+    setShowParticipants(false); // Close participant list to show map
   };
 
   // Loading state
@@ -335,6 +335,7 @@ export default function RoomPage() {
           eventId="39c3"
           isSharing={isSharing}
           onToggleSharing={handleToggleSharing}
+          zoomToLocation={zoomToLocation}
           onParticipantClick={(p) => {
             setSelectedParticipant(p);
             setShowParticipants(true);
@@ -397,10 +398,7 @@ export default function RoomPage() {
           }}
           onNavigate={() => {
             const { latitude, longitude } = selectedWaypoint.location;
-            window.open(
-              `https://www.google.com/maps/dir/?api=1&destination=${latitude},${longitude}`,
-              '_blank'
-            );
+            setZoomToLocation({ latitude, longitude });
             setSelectedWaypoint(null);
           }}
         />

src/components/map/DualMapView.tsx

@@ -42,6 +42,8 @@ interface DualMapViewProps {
   isSharing?: boolean;
   /** Callback to toggle location sharing */
   onToggleSharing?: () => void;
+  /** Location to zoom/fly to */
+  zoomToLocation?: { latitude: number; longitude: number } | null;
 }
 
 // CCC venue bounds (Hamburg Congress Center)
@@ -64,6 +66,7 @@ export default function DualMapView({
   onIndoorPositionSet,
   isSharing = false,
   onToggleSharing,
+  zoomToLocation,
 }: DualMapViewProps) {
   const [mode, setMode] = useState<MapMode>(initialMode);
   const [activeView, setActiveView] = useState<'outdoor' | 'indoor'>('outdoor');
@@ -129,6 +132,7 @@ export default function DualMapView({
           currentUserId={currentUserId}
           onParticipantClick={handleParticipantClick}
           onWaypointClick={handleWaypointClick}
+          zoomToLocation={zoomToLocation}
           routeSegments={activeRoute?.segments}
           routeLoading={activeRoute?.isLoading}
           routeError={activeRoute?.error}

src/components/map/MapView.tsx

@@ -17,6 +17,8 @@ interface MapViewProps {
   onMapClick?: (lngLat: { lng: number; lat: number }) => void;
   /** Auto-center on current user's location when first available */
   autoCenterOnUser?: boolean;
+  /** Location to zoom/fly to */
+  zoomToLocation?: { latitude: number; longitude: number } | null;
   /** Active route segments to display */
   routeSegments?: RouteSegment[];
   /** Route loading state */
@@ -64,6 +66,7 @@ export default function MapView({
   onWaypointClick,
   onMapClick,
   autoCenterOnUser = true,
+  zoomToLocation,
   routeSegments = [],
   routeLoading = false,
   routeError,
@@ -233,6 +236,21 @@ export default function MapView({
     }
   }, [participants, mapLoaded, currentUserId, onParticipantClick, autoCenterOnUser]);
 
+  // Fly to location when zoomToLocation changes
+  useEffect(() => {
+    if (!map.current || !mapLoaded || !zoomToLocation) return;
+
+    const { latitude, longitude } = zoomToLocation;
+    if (isValidCoordinate(latitude, longitude)) {
+      console.log('Flying to location:', latitude, longitude);
+      map.current.flyTo({
+        center: [longitude, latitude],
+        zoom: 17,
+        duration: 1500,
+      });
+    }
+  }, [zoomToLocation, mapLoaded]);
+
   // Update waypoint markers
   useEffect(() => {
     if (!map.current || !mapLoaded) return;