implementing favorite apps feature (#1410)

This PR implements favorite apps feature and addresses issue #827 
    
<!-- This is an auto-generated description by cubic. -->
---

## Summary by cubic
Adds a favorite apps feature with a star toggle in the sidebar.
Favorites are grouped separately and persisted, with optimistic UI
updates and e2e tests.

- **New Features**
- Added isFavorite to the apps schema and an IPC handler
(add-to-favorite) to toggle and persist the state.
  - Updated AppList to show “Favorite apps” and “Other apps” sections.
- Introduced AppItem component with a star button; uses
useAddAppToFavorite for optimistic updates and toasts.
  - Added Playwright tests to verify favoriting and unfavoriting.

- **Migration**
- Run DB migrations to add the apps.is_favorite column (defaults to 0).

<!-- End of auto-generated description by cubic. -->

src/ipc/handlers/app_handlers.ts

@@ -1075,6 +1075,53 @@ export function registerAppHandlers() {
     },
   );
 
+  ipcMain.handle(
+    "add-to-favorite",
+    async (
+      _,
+      { appId }: { appId: number },
+    ): Promise<{ isFavorite: boolean }> => {
+      return withLock(appId, async () => {
+        try {
+          // Fetch the current isFavorite value
+          const result = await db
+            .select({ isFavorite: apps.isFavorite })
+            .from(apps)
+            .where(eq(apps.id, appId))
+            .limit(1);
+
+          if (result.length === 0) {
+            throw new Error(`App with ID ${appId} not found.`);
+          }
+
+          const currentIsFavorite = result[0].isFavorite;
+
+          // Toggle the isFavorite value
+          const updated = await db
+            .update(apps)
+            .set({ isFavorite: !currentIsFavorite })
+            .where(eq(apps.id, appId))
+            .returning({ isFavorite: apps.isFavorite });
+
+          if (updated.length === 0) {
+            throw new Error(
+              `Failed to update favorite status for app ID ${appId}.`,
+            );
+          }
+
+          // Return the updated isFavorite value
+          return { isFavorite: updated[0].isFavorite };
+        } catch (error: any) {
+          logger.error(
+            `Error in add-to-favorite handler for app ID ${appId}:`,
+            error,
+          );
+          throw new Error(`Failed to toggle favorite status: ${error.message}`);
+        }
+      });
+    },
+  );
+
   ipcMain.handle(
     "rename-app",
     async (