#7173
(1) The command palette no longer has any selection by default.
If and when we introduce most recently used commands, defaulting to that
would make sense. A selection only appears when the arrow keys are used
or the user starts typing.
(2) The selection with arrow keys now wraps, so if you press "down" on
the last option, it will wrap to the first option, and if you press "up"
on the first option, it will wrap to the last option. This matches both
VSCode and Zed.
Removes the withAnimation closure which caused flashing when scrolling
up or down with arrow keys. Also removes the center anchor to behave
more like other command palletes (e.g., Zed, Raycast).
