feat(apollo-vertex): add Button AI variants

[petervachon]

Summary

Adds first-class AI variants to Button: ai (solid), ai-soft (secondary-equivalent), and ai-outline.

• registry/button/button.tsx: ai uses --ai-gradient-fill (white text, AA), ai-soft uses --ai-gradient (foreground text), ai-outline uses an --ai-gradient-strong gradient border with text-insight-600/400.
• app/components/button/page.mdx: an "AI" section documenting the three variants (with the AiMark) and a link to the AI Toolkit.

Dependencies

Stacked on #843 (AI primitives) for AiMark, used in the doc examples. Base will retarget to main after #843 merges.

Part of a set

One of a set splitting the AI visual expression work (originally draft #840). Full set linked below.

The full set

Merge order (each stacked PR retargets to main once its base merges):

1. feat(apollo-vertex): add Insight ramp and AI gradients to Foundation #844 Foundation: AI tokens + Insight ramp + colors page, base main (ROOT)
2. feat(apollo-vertex): add AiMark and AiGlow primitives #843 AI primitives (AiMark + AiGlow), base feat(apollo-vertex): add Insight ramp and AI gradients to Foundation #844
3. feat(apollo-vertex): add Badge AI variant #845 Badge AI variant, base feat(apollo-vertex): add AiMark and AiGlow primitives #843
4. feat(apollo-vertex): add Button AI variants #846 Button AI variants, base feat(apollo-vertex): add AiMark and AiGlow primitives #843
5. feat(apollo-vertex): add Input AI variant #847 Input AI variant, base feat(apollo-vertex): add AiMark and AiGlow primitives #843
6. feat(apollo-vertex): document Card AI glow #848 Card AI glow, base feat(apollo-vertex): add AiMark and AiGlow primitives #843
7. feat(apollo-vertex): add AI Toolkit guidance page #840 AI Toolkit guidance page, base feat(apollo-vertex): add Badge AI variant #845

[github-actions]

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Project	Deployment	Review	Updated (PT)
apollo-design	🟢 Ready	Preview, Logs	Jun 23, 2026, 01:05:08 PM
apollo-docs	🟢 Ready	Preview, Logs	Jun 23, 2026, 01:05:08 PM
apollo-landing	🟢 Ready	Preview, Logs	Jun 23, 2026, 01:05:08 PM
apollo-vertex	🟢 Ready	Preview, Logs	Jun 23, 2026, 01:05:08 PM

[github-actions]

Dependency License Review

• ✅ 1942 package(s) scanned
• ✅ No license issues found
• ⚠️ 2 package(s) excluded (see details below)

License distribution

License	Packages
MIT	1712
ISC	89
Apache-2.0	55
BSD-3-Clause	27
BSD-2-Clause	23
BlueOak-1.0.0	8
MPL-2.0	4
MIT-0	3
CC0-1.0	3
MIT OR Apache-2.0	2
(MIT OR Apache-2.0)	2
Unlicense	2
LGPL-3.0-or-later	1
Python-2.0	1
CC-BY-4.0	1
(MPL-2.0 OR Apache-2.0)	1
Unknown	1
Artistic-2.0	1
(WTFPL OR MIT)	1
(BSD-2-Clause OR MIT OR Apache-2.0)	1
CC-BY-3.0	1
0BSD	1
(MIT OR CC0-1.0)	1
MIT AND ISC	1

Excluded packages

Package	Version	License	Reason
@img/sharp-libvips-linux-x64	1.2.4	LGPL-3.0-or-later	LGPL pre-built binary, not linked
khroma	2.1.0	Unknown	MIT per GitHub repo, missing license field in package.json