fix: restore getPlaceDetails with Nominatim OSM implementation

- Replace stub with working Nominatim OSM place details lookup
- Fixes 'Failed to find Server Action' errors in logs
- Free, no API key required

tools/citrineos-core-main/apps/operator-ui/src/lib/server/actions/map/getPlaceDetails.ts

@@ -38,7 +38,33 @@ export async function getPlaceDetails(
       throw new Error('Place ID is required');
     }
 
-    // Return stub data - Google Places API removed, using OSM/Nominatim instead
+    try {
+      // Use Nominatim OSM for place details (free, no API key)
+      const url = `https://nominatim.openstreetmap.org/lookup?format=json&osm_ids=${placeId}&addressdetails=1`;
+      const response = await fetch(url, {
+        headers: { 'User-Agent': 'CitrineOS-Operator-UI/1.0' },
+      });
+
+      if (!response.ok) {
+        throw new Error(`Nominatim error: ${response.status}`);
+      }
+
+      const data = await response.json();
+      if (data && data.length > 0) {
+        const place = data[0];
+        return {
+          id: place.place_id?.toString() || placeId,
+          displayName: { text: place.display_name || '', languageCode: 'en' },
+          formattedAddress: place.display_name || '',
+          addressComponents: [],
+          location: {
+            latitude: parseFloat(place.lat) || 0,
+            longitude: parseFloat(place.lon) || 0,
+          },
+          types: place.type ? [place.type] : [],
+        };
+      }
+
       return {
         id: placeId,
         displayName: { text: '', languageCode: 'en' },
@@ -46,5 +72,15 @@ export async function getPlaceDetails(
         addressComponents: [],
         location: { latitude: 0, longitude: 0 },
       };
+    } catch (error) {
+      console.error('getPlaceDetails error:', error);
+      return {
+        id: placeId,
+        displayName: { text: '', languageCode: 'en' },
+        formattedAddress: '',
+        addressComponents: [],
+        location: { latitude: 0, longitude: 0 },
+      };
+    }
   });
 }