fix(ActionList): restore aria-disabled and data-truncate selectors for VRT compatibility

[Copilot]

Two CSS selector changes in ActionList broke VRT tests by not matching the actual DOM structure.

Changes

Restored aria-disabled check in hover state selector (line 129)

• Changed from &:not([data-disabled='true'], ...) back to &:not([aria-disabled], [data-disabled='true'], ...)
• When listSemantics is true, aria-disabled is set on the <li> element itself, not just data-disabled
• Without this check, disabled items incorrectly receive hover states

Restored :has() selector for truncate detection (line 645)

• Changed from &[data-truncate='true'] back to &:has([data-truncate='true'])
• The data-truncate attribute exists on child elements (<Truncate> component), not on ItemDescriptionWrap
• Self-selector never matched, breaking truncation layout

Changelog

New

None

Changed

• ActionList hover state selector now checks both [aria-disabled] and [data-disabled='true']
• ActionList truncate selector uses :has() to detect truncated children

Removed

None

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

All ActionList and Item unit tests pass. VRT tests should now pass with correct selector matching.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.