- Remove subject filter menu and related code - Simplify filtering to priority groups only - Keep Remove Filters button for priority reset - Clean up unused code and UI elements
- Implement MessagesProxyModel for client-side filtering - Add priority filter buttons (LOW 0-3, NORMAL 4-8, HIGH 9, CRITICAL 10 always shown) - Add subject filter menu with checkable actions for message titles - Add Remove Filters button to reset all filters - Restore priority 10 persistent notification setting in options - Fix settings dialog errors and update UI layouts - Ensure CRITICAL priority messages cannot be filtered out but can toggle persistent pop-ups
