Add "search buffers" icon/button/toggle to chat list menu
Idea
Add a Search buffers
menu inside the overflow menu.
When pressed, this would activate the buffer filter list until a buffer is selected (tapping, or for keyboard, via Enter).
Additional
This would mimic the desktop version's quick filtering method, accessible by pressing the Ctrl+S shortcut.
It'd be nice to have a way to access buffer filtering on mobile without needing the search to always be visible.