Add flag reason filter and improve handling of deleted content in review queue
This commit enhances the review queue with several key improvements:
1. Adds a new "Reason" filter to allow filtering flags by their score type
2. Improves UI for deleted content by:
- Adding visual indication for deleted posts (red background)
- Properly handling deleted content visibility for staff (category mods can not see deleted content)
3. Refactors reviewable score type handling for better code organization
4. Adds tests for trashed topics/posts visibility
This change will help moderators more efficiently manage the review queue by
being able to focus on specific types of flags and better identify deleted
content.
55a8184231