fix: autocomplete muestra Bogotá para usuario en Bucaramanga

- _mapCenter default cambiado de Bogotá a coordenadas más neutras
- Cuando GPS no está disponible/denegado, _centerOnUserCity() geocodifica
  la ciudad del perfil del usuario y centra el mapa ahí
- El autocomplete usa _mapCenter como bias → resultados ahora corresponden
  a la ciudad del usuario, no a Bogotá hardcodeado

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

lib/ui/views/dashboard_view.dart

@@ -37,7 +37,7 @@ class _DashboardViewState extends State<DashboardView> {
 
   // Map
   GoogleMapController? _mapController;
-  LatLng _mapCenter = const LatLng(4.6097, -74.0817);
+  LatLng _mapCenter = const LatLng(6.2442, -75.5812); // Medellín — centro geográfico de Colombia como fallback neutro
   bool _mapsReady = false;
   bool _mapsLoading = true;
   bool _geocoding = false;
@@ -88,14 +88,14 @@ class _DashboardViewState extends State<DashboardView> {
   Future<void> _detectLocation() async {
     try {
       bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
-      if (!serviceEnabled) return;
+      if (!serviceEnabled) { await _centerOnUserCity(); return; }
 
       LocationPermission permission = await Geolocator.checkPermission();
       if (permission == LocationPermission.denied) {
         permission = await Geolocator.requestPermission();
-        if (permission == LocationPermission.denied) return;
+        if (permission == LocationPermission.denied) { await _centerOnUserCity(); return; }
       }
-      if (permission == LocationPermission.deniedForever) return;
+      if (permission == LocationPermission.deniedForever) { await _centerOnUserCity(); return; }
 
       final pos = await Geolocator.getCurrentPosition(
         locationSettings: const LocationSettings(
@@ -108,7 +108,15 @@ class _DashboardViewState extends State<DashboardView> {
       if (mounted) setState(() => _mapCenter = latlng);
       _mapController?.animateCamera(CameraUpdate.newLatLngZoom(latlng, 16));
       _reverseGeocode(latlng);
-    } catch (_) {}
+    } catch (_) {
+      await _centerOnUserCity();
+    }
+  }
+
+  Future<void> _centerOnUserCity() async {
+    final city = user?.city;
+    if (city == null || city.isEmpty) return;
+    await _geocodeAndMoveMap(city);
   }
 
   Future<void> _reverseGeocode(LatLng pos) async {