[Feature Request]: Mark position when new videos start on the Subscription page

### Guidelines

- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the feature request I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.
- [X] This issue contains only one feature request.

### Problem Description

When you have a lot of subscripted channels, you might not remember which videos are the recently appeared ones, so it would be nice to a feature to mark the point when the last update occured.

### Proposed Solution

A visible mark, maybe a space between newer and older videos and a tag that says: **Older Videos:** or something like that.
I am sure someone can come up with a better naming.

### Alternatives Considered

-

### Issue Labels

display more information to user

### Additional Information

_No response_