[Feature Request]: Display visiual indicator on Navigation History route change to prevent brief display of previous 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

Navigation History will list the previous page for a split second when navigating to a route that has to load stuff e.g. watch page

https://github.com/user-attachments/assets/78fc0718-e3d9-4053-a538-7db2c8aa96f2

### Proposed Solution

Like laid out in https://github.com/FreeTubeApp/FreeTube/pull/6366#issuecomment-2548978255, display something that communicates to the user what is happening before the data gets fetched. I think `Loading...` is a good one.

### Alternatives Considered

none.

### Issue Labels

visual improvement

### Additional Information

As mentioned in https://github.com/FreeTubeApp/FreeTube/pull/6366#issuecomment-2548978255 this is expected behavior so thats why i created a feature request instead of a bug report.