Controller: character navigation in keyboard-only mode, plain Xbox face names (#326)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Claude <noreply@anthropic.com>

changes/controller-xbox-face-names.md

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+- With the Xbox **Button Style**, `Alt+C` names the face buttons `A`, `B`, `X` and `Y` instead of `A / Cross`, `B / Circle`, `X / Square` and `Y / Triangle`; PlayStation and Nintendo already showed their own names.

changes/keyboard-character-navigation.md

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+- Keyboard-only mode can move by character instead of by word: press `C`, or the new **Toggle Character Navigation** controller binding (unbound by default). The cursor box turns orange and covers one character, and a lookup searches from it, which reaches words the subtitle split cuts in two.