Controller: hold to show the secondary subtitle, dictionary entry navigation, standard button names (#312)

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

changes/controller-shortcuts.md

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+type: added
+area: overlay
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+- Added a controller binding that shows the secondary subtitle only while a button is held (`controller.bindings.holdSecondarySub`). It is unbound by default; assign it with Learn in the `Alt+C` controller modal. It works with or without keyboard-only mode and does not change the saved secondary subtitle mode.
+- Added controller bindings to select the previous or next word entry in the open Yomitan popup (`controller.bindings.previousEntry` / `nextEntry`). Mine Card mines the selected entry. Both are unbound by default; assign them with Learn in the `Alt+C` controller modal.

changes/controller-standard-button-names.md

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+type: fixed
+area: overlay
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+- The `Alt+C` controller screen now shows the right button names for controllers that report the W3C standard layout (most Xbox, PlayStation, Switch and 8BitDo pads). Previously Select and Start showed as `L3` and `R3`, and the triggers as `Back` and `Start`. Bindings themselves were unaffected.