feat: add updatedAt field to AchievementCard and related services

- Introduced `updatedAt` property in `AchievementData`, `KeyAccomplishment`, and `Task` interfaces for improved task tracking.
- Updated `AchievementCard` UI to display the last updated date alongside completion date, enhancing user visibility.
- Adjusted `UIShowcaseClient` and `TasksService` to include `updatedAt` values, ensuring consistency across task management components.

src/services/analytics/manager-summary.ts

@@ -42,6 +42,7 @@ export interface KeyAccomplishment {
   tags: string[];
   impact: 'high' | 'medium' | 'low';
   completedAt: Date;
+  updatedAt: Date;
   relatedItems: string[]; // IDs des tâches/checkboxes liées
   todosCount: number; // Nombre de todos associés
 }
@@ -261,6 +262,7 @@ export class ManagerSummaryService {
         tags: task.taskTags?.map(tt => tt.tag.name) || [],
         impact,
         completedAt: task.completedAt || task.updatedAt,
+        updatedAt: task.updatedAt,
         relatedItems: [task.id],
         todosCount: allRelatedTodos // Nombre total de todos associés à cette tâche
       });
@@ -283,6 +285,7 @@ export class ManagerSummaryService {
         tags: [], // Todos standalone n'ont pas de tags par défaut
         impact,
         completedAt: todo.date,
+        updatedAt: todo.date, // Pour les todos, updatedAt = completedAt
         relatedItems: [todo.id],
         todosCount: 1 // Un todo = 1 todo
       });