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/ipc_client.ts

@@ -274,6 +274,20 @@ export class IpcClient {
     return this.ipcRenderer.invoke("get-app", appId);
   }
 
+  public async addAppToFavorite(
+    appId: number,
+  ): Promise<{ isFavorite: boolean }> {
+    try {
+      const result = await this.ipcRenderer.invoke("add-to-favorite", {
+        appId,
+      });
+      return result;
+    } catch (error) {
+      showError(error);
+      throw error;
+    }
+  }
+
   public async getAppEnvVars(
     params: GetAppEnvVarsParams,
   ): Promise<{ key: string; value: string }[]> {