Draft: Improvement in Recent group for new files feature

This fixes the observer crash, so I don't need to restart the app to have the changes reflected.

Moves the recent group logic to Media Group Model after improvement

Attached , is a screen recording of the feature:

Simulator_Screen_Recording_-iPhone_15-_2024-07-19_at_19.12.14-2-2

The behaviour is as follows:

1. Newly added video is grouped in recents
2. Once Played , it's removed from this group as it's not new anymore.

Closes #683