fix(Banner): update layout to only create explicit row when actions are defined

[joshblack]

Closes https://github.com/github/primer/issues/5652

There was a space being generated in smaller viewports when no actions were present in a Banner. This was due to us creating two explicit rows and we had a row-gap defined. This change updates our rule to only create explicit rows when we have actions defined

Changelog

New

Changed

• Update layout logic within Banner to accommodate no actions

Removed

Rollout strategy

• Patch release

[changeset-bot]

🦋 Changeset detected

Latest commit: 57b9c41

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[Copilot]

Pull Request Overview

This PR fixes a layout issue in the Banner component where extra spacing was appearing below the description when no actions were present. The issue occurred because the CSS was creating explicit grid rows even when actions weren't needed.

Key changes:

• Modified CSS grid template to only create two rows when actions are present
• Added conditional grid layout using CSS :has() selector

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/react/src/Banner/Banner.module.css	Updated grid layout to conditionally apply two-row template only when actions container exists
.changeset/bright-dolls-dance.md	Added changeset entry documenting the layout fix

[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!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	90.2 KB (-0.02% 🔽)
packages/react/dist/browser.umd.js	90.38 KB (-0.01% 🔽)

[pksjce]

Seems like there's a Banner snapshot that's failing inside TreeView. Updating should fix it.

[langermank]

It's a little funny that the only VRT that picks this up is in TreeView 😂 should probably add a story + VRT to test this but merge away!