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/contexts/TasksContext.tsx

@@ -37,14 +37,13 @@ const TasksContext = createContext<TasksContextType | null>(null);
 interface TasksProviderProps {
   children: ReactNode;
   initialTasks: Task[];
-  initialStats: TaskStats;
   initialTags?: (Tag & { usage: number })[];
 }
 
-export function TasksProvider({ children, initialTasks, initialStats, initialTags }: TasksProviderProps) {
+export function TasksProvider({ children, initialTasks, initialTags }: TasksProviderProps) {
   const tasksState = useTasks(
     { limit: 20 },
-    { tasks: initialTasks, stats: initialStats }
+    { tasks: initialTasks }
   );
 
   const { tags, loading: tagsLoading, error: tagsError } = useTags(initialTags);