Refactor ActivityCard UI and improve voting functionality

- Updated ActivityCard layout for better visual consistency and responsiveness.
- Simplified the category badge and adjusted styles for better readability.
- Enhanced the voting section with a progress bar and improved button designs.
- Added a new method in Activity model to check if all trip participants approved an activity.
- Improved error handling and validation in ActivityRepository for voting and fetching activities.
- Implemented pagination in ActivityPlacesService for activity searches.
- Removed outdated scripts for cleaning up duplicate images.

lib/blocs/activity/activity_bloc.dart

@@ -61,17 +61,36 @@ class ActivityBloc extends Bloc<ActivityEvent, ActivityState> {
     Emitter<ActivityState> emit,
   ) async {
     try {
-      emit(const ActivitySearching());
+      // Si c'est un append (charger plus), on garde l'état actuel et on met isLoading à true
+      if (event.appendToExisting && state is ActivitySearchResults) {
+        final currentState = state as ActivitySearchResults;
+        emit(currentState.copyWith(isLoading: true));
+      } else {
+        emit(const ActivitySearching());
+      }
       
       final searchResults = await _placesService.searchActivities(
         destination: event.destination,
         tripId: event.tripId,
         category: event.category,
+        maxResults: event.maxResults ?? 20, // Par défaut 20, ou utiliser la valeur spécifiée
+        offset: event.offset ?? 0, // Par défaut 0
       );
       
+      List<Activity> finalResults;
+      
+      // Si on doit ajouter aux résultats existants
+      if (event.appendToExisting && state is ActivitySearchResults) {
+        final currentState = state as ActivitySearchResults;
+        finalResults = [...currentState.searchResults, ...searchResults];
+      } else {
+        finalResults = searchResults;
+      }
+      
       emit(ActivitySearchResults(
-        searchResults: searchResults,
+        searchResults: finalResults,
         query: event.category?.displayName ?? 'Toutes les activités',
+        isLoading: false,
       ));
     } catch (e) {
       _errorService.logError('activity_bloc', 'Erreur recherche activités: $e');