[UI] Show Feed Groups on the home screen

**Is your feature request related to a problem? Please describe.** I want to move several dozens of feeds spanning a dozen or more categories to twine. It is cumbersome to go to sidebar and **Describe the solution you'd like** * Design can be something like this mock <img width="470" height="692" alt="Image" src="https://github.com/user-attachments/assets/a3bb6b30-92eb-45ee-ac42-1831aa2577cc" /> * By default, no group should be selected - showing all feeds * Clicking a group should select/deselect that feed. At max, only one feed group can be selected * Long pressing a feed opens a popup to edit the feed group. We should be able to edit the name, icon ( pick from contained feeds ) and add/remove the feed items. **Additional context** I was exploring to build a RSS reader to replace reddit and other apps for me when landed onto this app. Liked the fact that it is open source and has really smooth UI. This design is what I was planning to put in my build, but interested in knowing if it appeals you too. If approved, I can contribute its development ( no guarantee of timeline )