Integrate categories & search function

[NeKoOuO]

Describe your suggested feature

The source search function should not only be divided into All and Pinned I hope to integrate categories and the search function and be able to choose which group to search.

Other details

Assuming that I have too many sources, causing each search to query a large number of sources, resulting in significant lag. I hope to be able to group these sources and only select one group for searching. Not just Pinned and All

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with an official extension, I should be opening an issue in the extensions repository.
• [X] I have updated the app to version 1.10.5.
• [X] I will fill out all of the requested information in this form.