[feature request] Have TAB move to next "button" instead of next item/entry

[ericsfraga]

It would be nice to have TAB (and S-TAB) move point to the next (previous) clickable item, e.g. a link, instead of skipping to the next entry in the room. As suggested, it would make sense to have n/p to move from item to item. This would align with other Emacs tools such as mastodon and gnus.
Thank you.

[alphapapa]

This seems like a good idea. It may require adjusting some of the button-related text properties in room buffers. Patches welcome, or I'll plan to get to it eventually.