[FR]: Remove All Saved Articles with Confirmatio

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the problem

sometimes you have a lot of saved articles, and when you remove them you currently have to remove them one by one.

### Describe the solution

Add a functionality to remove all saved articles in one click. This feature should also prompt the user to confirm if they really want to remove the articles or not.

### Additional context

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Start by locating the saved-articles screen and the existing one-by-one article removal flow. Check how removal state is handled, then implement the requested all-articles action with confirmation; done means users can remove all saved articles in one click only after confirming.

Written by the indexing model from the issue text.