Swapping keyboard layouts can leave `Key`s pressed after the user has released them.

## Bevy version and features

`0.19.1`, `main`

## What you did

1. Press any keyboard button.
1. Switch to a keyboard layout where that `KeyCode` maps to a different `Key`.
1. Release the button.

## What went wrong

The `Key` that was originally pressed is never normally released. Due to #25483, it is not even released when the window loses focus.

Start by reproducing the three-step sequence in Bevy 0.19.1 or main: press a key, switch to a layout with a different Key mapping, and release it. Trace the keyboard event handling for the original Key and verify that the pressed Key is released after the layout change, including the focus-loss behavior described in #25483.

Written by the indexing model from the issue text.