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.

src/app/kanban/KanbanPageClient.tsx

@@ -5,7 +5,7 @@ import { KanbanBoardContainer } from '@/components/kanban/BoardContainer';
 import { Header } from '@/components/ui/Header';
 import { TasksProvider, useTasksContext } from '@/contexts/TasksContext';
 import { UserPreferencesProvider, useUserPreferences } from '@/contexts/UserPreferencesContext';
-import { Task, Tag, TaskStats, UserPreferences } from '@/lib/types';
+import { Task, Tag, UserPreferences } from '@/lib/types';
 import { CreateTaskData } from '@/clients/tasks-client';
 import { CreateTaskForm } from '@/components/forms/CreateTaskForm';
 import { Button } from '@/components/ui/Button';
@@ -14,13 +14,12 @@ import { FontSizeToggle } from '@/components/ui/FontSizeToggle';
 
 interface KanbanPageClientProps {
   initialTasks: Task[];
-  initialStats: TaskStats;
   initialTags: (Tag & { usage: number })[];
   initialPreferences: UserPreferences;
 }
 
 function KanbanPageContent() {
-  const { stats, syncing, createTask, activeFiltersCount, kanbanFilters, setKanbanFilters } = useTasksContext();
+  const { syncing, createTask, activeFiltersCount, kanbanFilters, setKanbanFilters } = useTasksContext();
   const { preferences, updateViewPreferences } = useUserPreferences();
   const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
 
@@ -58,7 +57,6 @@ function KanbanPageContent() {
       <Header 
         title="Kanban Board" 
         subtitle="Gestionnaire de tâches"
-        stats={stats}
         syncing={syncing}
       />
       
@@ -181,12 +179,11 @@ function KanbanPageContent() {
   );
 }
 
-export function KanbanPageClient({ initialTasks, initialStats, initialTags, initialPreferences }: KanbanPageClientProps) {
+export function KanbanPageClient({ initialTasks, initialTags, initialPreferences }: KanbanPageClientProps) {
   return (
     <UserPreferencesProvider initialPreferences={initialPreferences}>
       <TasksProvider 
-        initialTasks={initialTasks} 
-        initialStats={initialStats}
+        initialTasks={initialTasks}
         initialTags={initialTags}
       >
         <KanbanPageContent />