[Feature Req] Methods to enable easier sorting of read and unread texts based on @mentions

The inbox should have an additional function to see the tagged messages instead of the 2 collapse states, which is either to see all or see none. It will help a lot in knowing exactly where I am tagged and what I'm tagged for instead of having to waste time searching through the possible unread messages before it for cases when I do not immediately browse through, otherwise give a function to add a read status on Mentions so I can mark which messages have I settled and which ones I haven't.