Feature Request: Favorite Locations with Daily Recommendations

**Description:**
Currently, after login or registration, users are redirected to the homepage.
I propose adding a "Choose Favorite Locations" step where users can select up to 3 favorite destinations.

**Proposed Flow:**

After login/register, redirect users to a "Choose Favorite Locations" page.

Allow users to select at most 3 destinations.

Store these preferences in the user’s profile (MongoDB).

On subsequent visits, when the user opens the app, show a daily recommended location from their favorites as a notification/banner.

**Benefits:**

Increases personalization of the app.

Makes the travel experience more engaging.

Encourages users to explore their favorite locations.

Start by tracing the existing login/register redirect and user-profile persistence in the MERN app, using the homepage and MongoDB-backed profile flow as entry points. Completion means users can select at most three locations, save them to their profile, pass through the selection step after login or registration, and see a daily favorite recommendation on later visits.

Written by the indexing model from the issue text.