Position and style the channel editor correctly

Fix a bug where some channel updates would be lost
Add channel name sanitization before storing in the database

crates/menu/src/menu.rs

@@ -7,6 +7,7 @@ gpui::actions!(
         SelectPrev,
         SelectNext,
         SelectFirst,
-        SelectLast
+        SelectLast,
+        ShowContextMenu
     ]
 );