feat: add todosCount to RecentTasks and TaskCard components

- Included `todosCount` prop in `RecentTasks` and `TaskCard` for better task management visibility.
- Updated `TaskCard` UI to display the number of related todos, enhancing user interaction.
- Modified `Task` interface and `TasksService` to support todos count retrieval from the database.
- Added sample `todosCount` values in `UIShowcaseClient` for demonstration purposes.

src/lib/types.ts

@@ -60,6 +60,7 @@ export interface Task {
   tfsTargetBranch?: string;
 
   assignee?: string;
+  todosCount?: number; // Nombre de todos reliés à cette tâche
 }
 
 // Interface pour les tags