fix: update labels in ManagerWeeklySummary and Header components

- Changed header title in `ManagerWeeklySummary` from "Résumé Manager" to "Weekly" for clarity.
- Updated navigation label in `Header` from "Manager" to "Weekly" to maintain consistency across the application.

src/components/dashboard/ManagerWeeklySummary.tsx

@@ -50,7 +50,7 @@ export default function ManagerWeeklySummary({ initialSummary }: ManagerWeeklySu
       {/* Header avec navigation */}
       <div className="flex items-center justify-between">
         <div>
-          <h1 className="text-2xl font-bold text-[var(--foreground)]">👔 Résumé Manager</h1>
+          <h1 className="text-2xl font-bold text-[var(--foreground)]">👔 Weekly</h1>
           <p className="text-[var(--muted-foreground)]">{formatPeriod()}</p>
         </div>
         <Button