Nomad Network Page Bookmarks + Optional Identify when connecting

[LinuxinaBit]

Similar to the functionality in NomadNet, the ability to save or bookmark pages in MeshChat would be very nice to have.
It is probably fine to implement this like the 'Conversations' and 'Announces' tabs on the messages page.

This could additionally make it harder for others to impersonate a node by just naming their node the same thing, because the identity hash and address of the real node are already saved in the 'bookmark'.
It's mostly a TOFU thing, but it's better than nothing.

Bookmarks also open the door for an Identify when connecting type option, allowing for true Reticulum identity based authentication for various nodes like nomadForum.
NomadNet already has the feature, and I think it's an important one to add support for in MeshChat.