Search and source improvements

Describe your suggested feature

There should be some functionality that allows you to pick a single source for a search. It's much more convenient than using the filter tool or just using search and scrolling to a specific preferred source.

Also about search, in the home screen, when you click the bottom right button to choose a source, there should also be a way to search the sources.

Finally, there should be a way to sort or filter the sources differently. For example, I want to filter out the sources that aren't English. I can't do that right now because that functionality is missing, but the app clearly cna categorise which sources are English and which aren't.

Other details

The first suggestion can be considered to be an improvement on the search tab, and the latter two suggestions can be considered improvements on the source picker, which both the home and search tab call into (home uses the bottom right button, and the search tab uses the top right button to filter sources)

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
• I will fill out all of the requested information in this form.

Start from the home screen source picker and the search tab's source controls, which the issue identifies as shared entry points. Determine how a single-source search, source searching, and language filtering or sorting would fit together; done means all three requested source-selection improvements work consistently in both flows.