Improve keystroke search in keymap editor (#34567)

This PR improves Keystroke search by:

1.  Allow searching by modifiers without additional keys.
2. Take match count into consideration when deciding if we should show
an action as a search match.
3. Take order into consideration as well.

Release Notes:

- N/A

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Co-authored-by: Ben Kunkle <ben@zed.dev>
13f4a093c8Anthony Eid committed on 7/16/2025, 6:19:41 PM· committed by GitHubparent573836a
2 files changedLine totals unavailable