feat: add weekly summary link to Header component

- Introduced a new navigation link for the weekly summary in the Header component, enhancing user access to summary insights.

src/app/weekly-summary/page.tsx

@@ -0,0 +1,20 @@
+import { Header } from '@/components/ui/Header';
+import WeeklySummaryClient from '@/components/dashboard/WeeklySummaryClient';
+import { WeeklySummaryService } from '@/services/weekly-summary';
+
+export default async function WeeklySummaryPage() {
+  // Récupération côté serveur
+  const summary = await WeeklySummaryService.getWeeklySummary();
+
+  return (
+    <div className="min-h-screen bg-[var(--background)]">
+      <Header />
+      
+      <div className="container mx-auto px-4 py-8">
+        <div className="max-w-6xl mx-auto">
+          <WeeklySummaryClient initialSummary={summary} />
+        </div>
+      </div>
+    </div>
+  );
+}