Turns out I only tested it with all tabs closed, the keybinding would
only work when all tabs were closed and you focused the agent panel. If
a file was opened in the center pane, cmd-f would open a search in that
file instead of searching in the agent panel, even if the thread view as
focused.

Closes #60686

Release Notes:

- agent: Fixed an issue where cmd-f would not work if file is open in
center pane