feat: add filter for completed tasks in the last 7 days

- Implemented `showCompletedLast7Days` filter in `KanbanFilters` to toggle visibility of tasks completed in the last week.
- Updated `GeneralFilters` to include a new filter chip for the completed tasks toggle.
- Enhanced `TasksProvider` to filter tasks based on the new criteria, improving task management capabilities.
- Adjusted `FilterSummary` to display the active filter status for better user feedback.

src/lib/types.ts

@@ -79,6 +79,7 @@ export interface KanbanFilters {
   showCompleted?: boolean;
   sortBy?: string;
   showWithDueDate?: boolean;
+  showCompletedLast7Days?: boolean;
   // Filtres spécifiques Jira
   showJiraOnly?: boolean;
   hideJiraTasks?: boolean;