Restaurants and Stores Not Being Added to Favorites in Web App

Describe the bug
In the Enatega web app, when users attempt to add a restaurant or store to their favorites list, the action does not work. Clicking the favorite (heart) icon has no effect—the item is not added to the favorites section, and no visual confirmation or feedback is shown.

To Reproduce
Steps to reproduce the behavior:

Log in to the Enatega web app
Browse to any restaurant or store
Click the favorite (heart) icon
Observe that the item is not added to the favorites list
Expected behavior
Clicking the favorite icon should immediately add the selected store or restaurant to the user's favorites list, with appropriate UI feedback (e.g., filled heart icon, success message).

Screenshots
Please insert screenshot or screen recording if available.

Desktop (please complete the following information):

OS: Windows 11

Browser: Chrome

Additional context
This issue could be due to a missing API call, failure in updating the database, or incorrect state management in the front-end. It affects user personalization and convenience.

Start by tracing the restaurant and store heart-icon interaction in the web app, then follow the favorites API, persistence, and front-end state flow. Reproduce the issue in Chrome and verify that selecting an item persists it in the favorites section and provides visible feedback.

Written by the indexing model from the issue text.