feat: update dashboard components and analytics for 7-day summaries

- Modified `ManagerWeeklySummary`, `MetricsTab`, and `ProductivityAnalytics` to reflect a focus on the last 7 days instead of the current week.
- Enhanced `ManagerSummaryService` and `MetricsService` to calculate metrics over a sliding 7-day window, improving data relevance.
- Added a new utility function `formatDistanceToNow` for better date formatting in French.
- Updated comments and documentation to clarify changes in timeframes.

src/actions/deadline-analytics.ts

@@ -0,0 +1,29 @@
+'use server';
+
+import { DeadlineAnalyticsService, DeadlineMetrics } from '@/services/analytics/deadline-analytics';
+
+export async function getDeadlineMetrics() {
+  try {
+    const metrics = await DeadlineAnalyticsService.getDeadlineMetrics();
+    return { success: true, data: metrics };
+  } catch (error) {
+    console.error('Erreur lors de la récupération des métriques d\'échéance:', error);
+    return { 
+      success: false, 
+      error: error instanceof Error ? error.message : 'Erreur lors de la récupération des métriques d\'échéance'
+    };
+  }
+}
+
+export async function getCriticalDeadlines() {
+  try {
+    const tasks = await DeadlineAnalyticsService.getCriticalDeadlines();
+    return { success: true, data: tasks };
+  } catch (error) {
+    console.error('Erreur lors de la récupération des échéances critiques:', error);
+    return { 
+      success: false, 
+      error: error instanceof Error ? error.message : 'Erreur lors de la récupération des échéances critiques'
+    };
+  }
+}