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/components/deadline/index.ts

@@ -0,0 +1,4 @@
+export { DeadlineOverview } from './DeadlineOverview';
+export { DeadlineRiskCard } from './DeadlineRiskCard';
+export { CriticalDeadlinesCard } from './CriticalDeadlinesCard';
+export { DeadlineSummaryCard } from './DeadlineSummaryCard';