feat: enhance global search and map experience

- Global Activity Search:
  - Allow searching activities globally (not just in destination).
  - Add distance warning for activities > 50km away.
- Create Trip UI:
  - Fix destination suggestion list overflow.
  - Prevent suggestion list from reappearing after selection.
- Map:
  - Add generic text search support (e.g., "Restaurants") on 'Enter'.
  - Display multiple results for generic searches.
  - Resize markers (User 60.0, Places 50.0).
  - Standardize place markers to red pin.

lib/components/activities/activities_page.dart

@@ -13,6 +13,7 @@ import '../../blocs/user/user_bloc.dart';
 import '../../blocs/user/user_state.dart';
 import '../../services/error_service.dart';
 import 'activity_detail_dialog.dart';
+import 'package:geolocator/geolocator.dart';
 
 class ActivitiesPage extends StatefulWidget {
   final Trip trip;
@@ -637,6 +638,23 @@ class _ActivitiesPageState extends State<ActivitiesPage>
               activity.name.toLowerCase().trim(),
         );
 
+    // Calculer la distance si c'est une suggestion Google et que le voyage a des coordonnées
+    double? distanceInKm;
+    if (isGoogleSuggestion &&
+        widget.trip.hasCoordinates &&
+        activity.latitude != null &&
+        activity.longitude != null) {
+      final distanceInMeters = Geolocator.distanceBetween(
+        widget.trip.latitude!,
+        widget.trip.longitude!,
+        activity.latitude!,
+        activity.longitude!,
+      );
+      distanceInKm = distanceInMeters / 1000;
+    }
+
+    final isFar = distanceInKm != null && distanceInKm > 50;
+
     return GestureDetector(
       onTap: () {
         showDialog(
@@ -709,6 +727,40 @@ class _ActivitiesPageState extends State<ActivitiesPage>
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
+                  if (isFar)
+                    Container(
+                      margin: const EdgeInsets.only(bottom: 12),
+                      padding: const EdgeInsets.symmetric(
+                        horizontal: 12,
+                        vertical: 8,
+                      ),
+                      decoration: BoxDecoration(
+                        color: theme.colorScheme.errorContainer,
+                        borderRadius: BorderRadius.circular(8),
+                        border: Border.all(
+                          color: theme.colorScheme.error.withValues(alpha: 0.5),
+                        ),
+                      ),
+                      child: Row(
+                        children: [
+                          Icon(
+                            Icons.warning_amber_rounded,
+                            color: theme.colorScheme.error,
+                            size: 20,
+                          ),
+                          const SizedBox(width: 8),
+                          Expanded(
+                            child: Text(
+                              'Activité éloignée : ${distanceInKm!.toStringAsFixed(0)} km du lieu du voyage',
+                              style: theme.textTheme.bodySmall?.copyWith(
+                                color: theme.colorScheme.onErrorContainer,
+                                fontWeight: FontWeight.w600,
+                              ),
+                            ),
+                          ),
+                        ],
+                      ),
+                    ),
                   Row(
                     children: [
                       // Icône de catégorie