[BUG] Getting CORS error in dev login.

### Browser

Chrome

### Area

Auth (login / Google sign-in)

### Steps to reproduce

Start the server on any frontend port other than 5173.

### Expected behavior

The application should work on any frontend port.

### What actually happened

While setting up the project, I was facing CORS error in dev login.

This happened because vite picked up some other port than 5173, which is hardcoded in the backend for course.

This can be solved by setting up a backend proxy in vite.config.js:

```js
export default defineConfig({
plugins: [react()],},
server: {
port: 5173,
proxy: {
'/api': {
target: 'http://localhost:3000',
changeOrigin: true,
},
},
},
});
```

### Logs / Screenshots