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/dashboard/ProductivityAnalytics.tsx

@@ -8,6 +8,7 @@ import { VelocityChart } from '@/components/charts/VelocityChart';
 import { PriorityDistributionChart } from '@/components/charts/PriorityDistributionChart';
 import { WeeklyStatsCard } from '@/components/charts/WeeklyStatsCard';
 import { Card } from '@/components/ui/Card';
+import { DeadlineOverview } from '@/components/deadline/DeadlineOverview';
 
 export function ProductivityAnalytics() {
   const [metrics, setMetrics] = useState<ProductivityMetrics | null>(null);
@@ -67,7 +68,10 @@ export function ProductivityAnalytics() {
 
   return (
     <div className="space-y-8">
-      {/* Titre de section */}
+      {/* Section Échéances Critiques */}
+      <DeadlineOverview />
+
+      {/* Titre de section Analytics */}
       <div className="flex items-center justify-between">
         <h2 className="text-2xl font-bold">📊 Analytics & Métriques</h2>
         <div className="text-sm text-[var(--muted-foreground)]">