fix: autocomplete muestra resultados de Medellín para usuario en Bucaramanga

Default _mapCenter era Medellín (nuevo fallback neutro) pero se usaba como
bias de coordenadas en el autocomplete antes de que GPS/geocoding terminara.
Ahora:
- _mapPositioned=false hasta que GPS o _centerOnUserCity actualice el centro
- Autocomplete omite parámetro location hasta que _mapPositioned=true
- Mientras tanto, la ciudad del usuario se agrega al query de texto para biasear

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

lib/ui/views/dashboard_view.dart

@@ -59,6 +59,9 @@ class _DashboardViewState extends State<DashboardView> {
   // Throttle reverse geocode on camera idle
   DateTime _lastGeocode = DateTime(0);
 
+  // Indica si _mapCenter ya fue fijado por GPS o geocoding (no el default)
+  bool _mapPositioned = false;
+
   // Ciudad detectada, disponibilidad y coincidencia con perfil
   String _detectedCity = '';
   bool _cityAvailable = true;
@@ -105,7 +108,7 @@ class _DashboardViewState extends State<DashboardView> {
       );
 
       final latlng = LatLng(pos.latitude, pos.longitude);
-      if (mounted) setState(() => _mapCenter = latlng);
+      if (mounted) setState(() { _mapCenter = latlng; _mapPositioned = true; });
       _mapController?.animateCamera(CameraUpdate.newLatLngZoom(latlng, 16));
       _reverseGeocode(latlng);
     } catch (_) {
@@ -207,7 +210,7 @@ class _DashboardViewState extends State<DashboardView> {
             (loc['lat'] as num).toDouble(),
             (loc['lng'] as num).toDouble(),
           );
-          if (mounted) setState(() => _mapCenter = pos);
+          if (mounted) setState(() { _mapCenter = pos; _mapPositioned = true; });
           _mapController?.animateCamera(CameraUpdate.newLatLngZoom(pos, 16));
         }
       }
@@ -221,17 +224,16 @@ class _DashboardViewState extends State<DashboardView> {
       return;
     }
     _debounce = Timer(const Duration(milliseconds: 450), () async {
-      // Bias autocomplete toward user's city when not already mentioned
+      // Bias toward user's city: if map not yet positioned, append city to query
+      // and skip the coordinates bias (which would be a wrong default location)
       final userCity = user?.city;
-      final input = (userCity != null &&
-              userCity.isNotEmpty &&
-              !value.toLowerCase().contains(userCity.toLowerCase()))
-          ? '$value $userCity'
-          : value;
-      final uri = Uri.https('admin.prosapp.co', '/autocomplete', {
-        'input': input,
-        'location': '${_mapCenter.latitude},${_mapCenter.longitude}',
-      });
+      final cityMissing = userCity != null &&
+          userCity.isNotEmpty &&
+          !value.toLowerCase().contains(userCity.toLowerCase());
+      final input = cityMissing ? '$value $userCity' : value;
+      final params = <String, String>{'input': input};
+      if (_mapPositioned) params['location'] = '${_mapCenter.latitude},${_mapCenter.longitude}';
+      final uri = Uri.https('admin.prosapp.co', '/autocomplete', params);
       final response = await NetworkUtility.fetchUrl(uri);
       if (response != null && mounted) {
         final decoded = jsonDecode(response);