Collab UI v2 (#2618)

This PR implements
https://www.figma.com/file/pLq7dvhx2mFeWFOedXpUQ5/Project-%E2%80%93-Collaboration-UI?type=design&node-id=666%3A8610&t=XFGk6KEtTCFXBvCQ-1

Release notes:
- [x] Redesigned collaboration UI
- [x] Added voice support

crates/zed/src/main.rs

@@ -889,6 +889,6 @@ pub fn background_actions() -> &'static [(&'static str, &'static dyn Action)] {
         ("Go to file", &file_finder::Toggle),
         ("Open command palette", &command_palette::Toggle),
         ("Open recent projects", &recent_projects::OpenRecent),
-        ("Change your settings", &zed::OpenSettings),
+        ("Change your settings", &zed_actions::OpenSettings),
     ]
 }