fix(AnchoredOverlay): Remove use of useResponsiveValue

[francinelucca]

Closes https://github.com/github/primer/issues/6022

Changelog

Removed

• use of useResponsiveValue in AnchoredOverlay in favor of css solution

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

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)

[changeset-bot]

⚠️ No Changeset found

Latest commit: c37bbf6

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[francinelucca]

from what I can tell there is not real usage to this

[Copilot]

Pull Request Overview

This pull request refactors the Overlay component to use CSS custom properties (CSS variables) for positioning instead of inline styles. The changes move position values (top, left, right, bottom) from direct inline style properties to CSS custom properties that are consumed by the CSS module.

Key changes:

• CSS custom properties (--top, --left, --right, --bottom) are now set in the inline style instead of direct CSS properties
• The CSS module consumes these custom properties to apply positioning
• Removed unused useResponsiveValue import and logic from AnchoredOverlay
• Removed data-variant attribute from the overlay element

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/Overlay/Overlay.tsx	Changed positioning from inline CSS properties to CSS custom properties
packages/react/src/Overlay/Overlay.module.css	Added CSS rules to consume the custom properties for positioning
packages/react/src/AnchoredOverlay/AnchoredOverlay.tsx	Removed unused responsive variant logic and simplified position prop passing
packages/react/src/AnchoredOverlay/snapshots/AnchoredOverlay.test.tsx.snap	Updated snapshot to reflect new CSS custom property style format

[francinelucca]

this css rule already takes care of resetting top/left, switched up the inline styles in the BaseOverlay as well to be css variables applied by the className so that they don't win over specificity

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/5918

[primer-integration]

🟢 ci completed with status success.

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[francinelucca]

Waiting to merge until landing dotcom changes https://github.com/github/github-ui/pull/6032