fix(docs): polish page action layout

[vincentkoc]

Summary

• keep the Copy page split-button label on one line
• restore spacing after code blocks inside step lists
• add fixture, smoke, and visual coverage for both layout contracts

Validation

• git diff --check
• node --check scripts/docs-site/assets.mjs scripts/docs-site/smoke.mjs scripts/docs-site/visual-smoke.mjs
• npm run docs:build:shell && npm run docs:smoke:shell && npm run docs:visual
• make docs-check
• autoreview --mode local --parallel-tests "npm run docs:build:shell && npm run docs:smoke:shell && npm run docs:visual"

[mintlify]

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Project	Status	Preview	Updated (UTC)
clawdhub	🟡 Building	–	Jun 3, 2026, 1:45 PM

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