feat: add due date filter to KanbanFilters

- Introduced `showWithDueDate` option in `KanbanFilters` to filter tasks based on due dates.
- Added toggle button in the UI for users to easily enable/disable this filter.
- Updated `TasksContext` to handle the new filter state and applied filtering logic in task retrieval.
- Ensured user preferences are saved with the new filter option in `user-preferences.ts`.

src/services/core/user-preferences.ts

@@ -17,7 +17,8 @@ const DEFAULT_PREFERENCES: UserPreferences = {
     tags: [],
     priorities: [],
     showCompleted: true,
-    sortBy: ''
+    sortBy: '',
+    showWithDueDate: false
   },
   viewPreferences: {
     compactView: false,