[jooyoungseo]

Description

Closes #15159.
Closes #15160.

Backport hakimel/reveal.js#3953 to the bundled reveal.js 5.1.0:

• Give the speaker-view Layout select a native, stable accessible name and a visible focus indicator.
• Add named region landmarks for Current slide, Upcoming slide, Time, and Speaker notes, preserving the existing hidden-layout and empty-notes behavior.
• Name the preview iframes and stop forwarding keys from native controls to the slide preview.
• Replace the slide-controls aside with a neutral div. The previous/next buttons remain accessible buttons without creating a separate complementary landmark in the main presentation or its preview.

The new source patch applies after the three existing reveal.js patches. The dependency-update script now rebuilds the plugins as well as the core, so future updates retain the notes-template fix. Included core UMD/ESM bundles and source maps, notes UMD/ESM bundles, and the speaker-view template were rebuilt from the 5.1.0 source using its Gulp/Rollup pipeline; they are not hand-edited minified bundles. Existing announcement and focus patches are retained.

Validation

• Official 5.1.0 core/plugin rebuild with Node 22.23.4 passed. Verified that the backport patch matches the built source and the source maps contain the updated controls source.
• Added seven Playwright speaker-view tests covering the accessible name, keyboard focus and selection, all four layouts, named regions, preview titles, native navigation buttons, fragments, and empty/restored notes.
• Ran the new suite together with the existing fragment-announcement, image-announcement, and visibility/focus suites in Chromium: 29 tests passed.
• Local fixtures were rendered with Quarto CLI 1.11.5, then supplied with this branch's rebuilt reveal.js assets. The focused run used a local static server and Chrome Headless Shell 152; it did not rebuild the entire Quarto executable or run the complete Quarto test suite.
• The reporter tested the review HTML with a screen reader, requested the controls-landmark correction, and approved the revised build before submission. The review builds also passed 124 automated accessibility-tree/DOM/interaction checks across standalone reveal.js and Quarto, over HTTP and direct file loading.

The existing physical-Space shortcut behavior on a focused previous-slide button is unchanged and not part of this backport.

Checklist

• Referenced the issues this PR closes
• Updated news/changelog-1.11.md
• Added new tests
• Ran the focused new and related regression suites described above
• Ran the complete Quarto test suite (not run; this is a vendored reveal.js backport)
• Documentation PR: not applicable; no author-facing configuration changes

AI-assisted PR

• AI tool used: OpenAI assistant through Aside.
• Codebase grounding: Local reveal.js and quarto-cli clones, the existing source patches and dependency-update procedure, and the repositories' QUnit/Playwright tests.
• Human review: The contributor tested the candidate with a screen reader, supplied corrective feedback about the navigation-button landmark, and explicitly approved the revised build and this PR submission. The assistant performed the source/build verification and automated tests reported above. No specific screen reader/browser version is claimed for the manual check.

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