close#1514
A query submitted from the companion remote now behaves like a submit
instead of focus-to-type: TvKeyboardController closes an already-open
OSK and lands focus on the input without reopening it, then the shared
handleSearchSubmit path runs the search and focuses the first result.
Also guard DebouncedMediaSearch against selection-only controller
notifications re-arming the debounce into a duplicate fetch.
Co-authored-by: l3gitpanda <12003346+l3gitpanda@users.noreply.github.com>
