Blocked on #2728 Starring/unstarring sources should add a pending event which will eventually be submitted as part of [sync](https://docs.google.com/document/d/1wO2MCJI5Xm_BM98JeSBIxEPne4PWNjV9cQNegAPNZp0/edit?tab=t.0#heading=h.d1vlzury7p63) to the server.
