Improve announcement card display and fix creation bug

Update the announcement card component to match the dashboard's visual style and resolve an issue where new announcements were not displaying correctly due to incorrect data handling and display logic.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce/dnQ3tT8

client/src/components/tasks/RecentTasksCard.tsx

@@ -33,7 +33,7 @@ export default function RecentTasksCard() {
     queryFn: () => {
       const params = new URLSearchParams();
       if (selectedStoreId) {
-        params.append('storeId', selectedStoreId);
+        params.append('storeId', selectedStoreId.toString());
       }
       return fetch(`/api/tasks?${params.toString()}`).then(res => res.json());
     },