UI: Fix text color for failing stories in sidebar

[ghengeveld]

Closes #31462

What I did

Replaced wrong CSS text color for stories with error status in the sidebar, according to designs.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

This PR addresses an accessibility issue in Storybook's UI by changing the text color for failing stories in the sidebar from brown to #D43900 (a bright red). This change improves color contrast and visibility, particularly when using the Vitest addon under different theme configurations.

The modification is focused on the status.tsx file where the error status color is defined. This change enhances the user experience by making error states more visually distinct and maintaining better accessibility standards.

Confidence score: 4/5

1. This is a safe UI-only change that affects color values
2. The score reflects the straightforward nature of the change and its limited scope, with only minor uncertainty due to lack of unit tests
3. Files needing attention:
   • code/core/src/manager/utils/status.tsx - Verify the new color works across all theme configurations

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[greptile-apps]

Reviewing changes made in this pull request

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☁️ Nx Cloud last updated this comment at 2025-07-15 08:41:51 UTC

[storybook-app-bot]

Package Benchmarks

^{Commit: ddbd787, ran on 15 July 2025 at 08:32:12 UTC}

The following packages have significant changes to their size or dependencies:

storybook

	Before	After	Difference
Dependency count	51	51	0
Self size	31.75 MB	31.76 MB	🚨 +15 KB 🚨
Dependency size	17.43 MB	17.43 MB	0 B
Bundle Size Analyzer	Link	Link

sb

	Before	After	Difference
Dependency count	52	52	0
Self size	1 KB	1 KB	0 B
Dependency size	49.18 MB	49.20 MB	🚨 +15 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/cli

	Before	After	Difference
Dependency count	217	217	0
Self size	582 KB	582 KB	0 B
Dependency size	93.66 MB	93.67 MB	🚨 +12 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/codemod

	Before	After	Difference
Dependency count	186	186	0
Self size	31 KB	31 KB	0 B
Dependency size	77.76 MB	77.77 MB	🚨 +12 KB 🚨
Bundle Size Analyzer	Link	Link