feat: add updatedAt field to TaskType and adjust completedAt logic

- Introduced `updatedAt` property in `TaskType` for better task tracking.
- Modified `completedAt` assignment to use `task.updatedAt` when `completedAt` is undefined, ensuring more accurate task completion timestamps.

src/services/analytics/manager-summary.ts

@@ -8,6 +8,7 @@ type TaskType = {
   priority: string; // high, medium, low
   completedAt?: Date | null;
   createdAt: Date;
+  updatedAt: Date;
   taskTags?: {
     tag: {
       name: string;
@@ -159,6 +160,7 @@ export class ManagerSummaryService {
         priority: true,
         completedAt: true,
         createdAt: true,
+        updatedAt: true,
         taskTags: {
           select: {
             tag: {
@@ -258,7 +260,7 @@ export class ManagerSummaryService {
         description: task.description || undefined,
         tags: task.taskTags?.map(tt => tt.tag.name) || [],
         impact,
-        completedAt: task.completedAt || getToday(),
+        completedAt: task.completedAt || task.updatedAt,
         relatedItems: [task.id],
         todosCount: allRelatedTodos // Nombre total de todos associés à cette tâche
       });