Block Mover: Add the keyboard shortcut to the buttons' spoken description

[ntsekouras]

What?

Resolves: #51647

For a11y reasons it was suggested to also add the shortcut to the block mover's spoken description.

This PR does that.

I didn't wrap the tooltip shortcut in parentheses as also suggested in the comment, because I didn't find any other tooltip shortcut in the editor that uses them. I think this should be discussed separately if needed and is not limited to the block mover tooltip.

Testing Instructions

1. Select a block focus the Move up or Move down button in the block toolbar with a screen reader (e.g. VoiceOver).
2. The description should now end with the shortcut, e.g. "Move Paragraph block from position 2 up to position 1 (Shift + Option + Command + T)".

Screenshots or screencast

Screen.Recording.2026-08-10.at.1.25.36.PM.mov

Use of AI Tools

Generated with Fable 5 and adjusted/reviewed manually.

[github-actions]

Size Change: +52 B (0%)

Total Size: 7.65 MB

📦 View Changed

Filename	Size	Change
build/scripts/block-editor/index.min.js	434 kB	+52 B (+0.01%)

_{compressed-size-action}

[t-hamano]

LGTM! It also works correctly with Windows NVDA.

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[Mamaduka]

Code looks good.

Does the project include shortcuts in spoken messages anywhere else? Mostly want to know if we're establishing a new pattern?

[ntsekouras]

Does the project include shortcuts in spoken messages anywhere else? Mostly want to know if we're establishing a new pattern?

Shortcuts are announced in a few places already like menu items in block options (from block toolbar) and it seems ui package also tries to do that more and more with aria-keyshortcuts. I don't think we do it for every button that has a shortcut though.