feat: Enhance collection sharing and location management features

- Implemented unsharing functionality in CollectionViewSet, including removal of user-owned locations from collections.
- Refactored ContentImageViewSet to support multiple content types and improved permission checks for image uploads.
- Added user ownership checks in LocationViewSet for delete operations.
- Enhanced collection management in the frontend to display both owned and shared collections separately.
- Updated Immich integration to handle access control based on location visibility and user permissions.
- Improved UI components to show creator information and manage collection links more effectively.
- Added loading states and error handling in collection fetching logic.

backend/server/adventures/signals.py

@@ -6,7 +6,10 @@ from adventures.models import Location
 def update_adventure_publicity(sender, instance, action, **kwargs):
     """
     Signal handler to update adventure publicity when collections are added/removed
+    This function checks if the adventure's collections contain any public collection.
     """
+    if not isinstance(instance, Location):
+        return
     # Only process when collections are added or removed
     if action in ('post_add', 'post_remove', 'post_clear'):
         collections = instance.collections.all()