feat: Add calendar page, enhance activity search and approval logic, and refactor activity filtering UI.

lib/blocs/activity/activity_event.dart

@@ -50,7 +50,15 @@ class SearchActivities extends ActivityEvent {
   });
 
   @override
-  List<Object?> get props => [tripId, destination, category, maxResults, offset, reset, appendToExisting];
+  List<Object?> get props => [
+    tripId,
+    destination,
+    category,
+    maxResults,
+    offset,
+    reset,
+    appendToExisting,
+  ];
 }
 
 /// Event to search activities using coordinates directly (bypasses geocoding)
@@ -76,7 +84,16 @@ class SearchActivitiesWithCoordinates extends ActivityEvent {
   });
 
   @override
-  List<Object?> get props => [tripId, latitude, longitude, category, maxResults, offset, reset, appendToExisting];
+  List<Object?> get props => [
+    tripId,
+    latitude,
+    longitude,
+    category,
+    maxResults,
+    offset,
+    reset,
+    appendToExisting,
+  ];
 }
 
 /// Event to search activities by text query
@@ -95,6 +112,21 @@ class SearchActivitiesByText extends ActivityEvent {
   List<Object> get props => [tripId, destination, query];
 }
 
+class UpdateActivityDate extends ActivityEvent {
+  final String tripId;
+  final String activityId;
+  final DateTime? date;
+
+  const UpdateActivityDate({
+    required this.tripId,
+    required this.activityId,
+    this.date,
+  });
+
+  @override
+  List<Object?> get props => [tripId, activityId, date];
+}
+
 /// Event to add a single activity to the trip
 class AddActivity extends ActivityEvent {
   final Activity activity;
@@ -147,11 +179,7 @@ class FilterActivities extends ActivityEvent {
   final double? minRating;
   final bool? showVotedOnly;
 
-  const FilterActivities({
-    this.category,
-    this.minRating,
-    this.showVotedOnly,
-  });
+  const FilterActivities({this.category, this.minRating, this.showVotedOnly});
 
   @override
   List<Object?> get props => [category, minRating, showVotedOnly];
@@ -228,4 +256,4 @@ class AddActivityAndRemoveFromSearch extends ActivityEvent {
 
   @override
   List<Object> get props => [activity, googleActivityId];
-}
+}