Controller: layouts for the media timing review and duplicate card dialogs (#313)

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

changes/controller-field-grouping.md

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+- The duplicate card (field grouping) dialog has a controller layout: the D-pad picks the original or new card, `A` continues and confirms the merge, `B` cancels or goes back from the preview, `X` turns "Delete duplicate" on or off, `Y` switches Compact / Full, and the D-pad scrolls the preview. Each control shows its shortcut, and the layout can be changed per controller in the new **Duplicate card (field grouping)** group of `Alt+C`.

changes/controller-media-timing-review.md

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+- Added a controller layout for the media timing review dialog covering every button, with L1 / R1 + D-pad combos for the clip start and end, and D-pad actions that repeat while held. Each button shows its controller shortcut while controller support is on, and the first press in a newly opened dialog already counts. The controller's usual actions pause while the dialog is open, including in the hidden subtitle overlay behind it.
+- Added `controller.faceButtonLabels` (`xbox` or `nintendo`) so fixed controller layouts and the `Alt+C` button names follow the letters printed on the pad. Use `nintendo` for controllers with A on the right and B at the bottom.

changes/controller-review-remap.md

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+- The media timing review controller layout can now be changed in the new **Review media timing** group of `Alt+C`. Learn records a single button or a combo (hold one button, press another), any button can be a hold button, changes are saved per controller, rows warn about clashing inputs, and **Reset all** restores the default layout. The review's button hints follow your bindings.
+- A newly opened `Alt+C` window shows and edits your saved controller's bindings until it sees the controller (browsers hide a pad from a new window until a button is pressed in it); before, it showed and edited the global defaults, and the status could stay stuck on "No controllers detected".