feat: remove TaskStats from HomePageClient and Header components

- Eliminated `initialStats` prop from `HomePageClient` and `KanbanPageClient` to streamline data handling.
- Updated `Header` and `HeaderContainer` components to remove references to `stats`, enhancing clarity and reducing unnecessary complexity.
- Adjusted `useTasks` hook to make `stats` optional, ensuring compatibility with the updated components.

components/ui/HeaderContainer.tsx

@@ -6,30 +6,15 @@ import { useTasks } from '@/hooks/useTasks';
 interface HeaderContainerProps {
   title: string;
   subtitle: string;
-  initialStats: {
-    total: number;
-    completed: number;
-    inProgress: number;
-    todo: number;
-    backlog: number;
-    cancelled: number;
-    freeze: number;
-    archived: number;
-    completionRate: number;
-  };
 }
 
-export function HeaderContainer({ title, subtitle, initialStats }: HeaderContainerProps) {
-  const { stats, syncing } = useTasks(
-    { limit: 1 }, // Juste pour les stats
-    { tasks: [], stats: { ...initialStats, backlog: 0, cancelled: 0, freeze: 0, archived: 0 } }
-  );
+export function HeaderContainer({ title, subtitle }: HeaderContainerProps) {
+  const { syncing } = useTasks();
 
   return (
     <Header 
       title={title}
       subtitle={subtitle}
-      stats={stats}
       syncing={syncing}
     />
   );