fix: restore admin bar contrast in Light scheme

[akira-in-tech]

Summary

• add a Light admin color scheme override for the presence count, secondary labels, and screen descriptions
• use WordPress gray #50575e, which provides a 7.33:1 contrast ratio against the Light scheme's white submenu
• add a Playwright regression test that checks the rendered foreground and effective background colors for WCAG AA contrast

Root cause

The presence admin bar styles used #a7aaad for secondary text regardless of the selected WordPress admin color scheme. That color works against the default dark submenu, but the Light scheme uses a white submenu and also gives the top-level count a low-contrast inherited color.

The override is scoped to .admin-color-light, so the existing appearance of the other admin color schemes is unchanged.

Fixes #266

Validation

• ./vendor/bin/phpcs --standard=phpcs.xml.dist
• ./vendor/bin/phpstan analyse --configuration=phpstan.neon.dist --memory-limit=2G
• npm run test:scripts — 54 passed
• npm test — 186 tests, 415 assertions, 5 skipped
• npm run test:e2e — 16 passed

The local wp-env run used WP_ENV_CORE=WordPress/WordPress#7.0.3 because the current latest-version resolver requested the not-yet-available 7.0.4 Git ref. The four wp-env-backed jobs fail before test execution for the same reason on the latest main run.

Use of AI Tools

AI assistance: Yes
Tool(s): OpenAI Codex
Model(s): GPT-5
Used for: Implementation and regression-test drafting; the final diff and validation results were reviewed by the contributor.

[github-actions]

▶ Preview in WordPress Playground

Boots a fresh WordPress with this PR's presence-api build, seeds 5 demo users, and drops you on the dashboard.

_{Stress-test variant: 40 demo users · Built from 4376e2e57be4e95d7e247674be188730e8549cfc. Auto-updates when you push.}

[akira-in-tech]

Visual verification

Validated the PR build in the generated WordPress Playground preview.

• Fresh: existing dark submenu styling remains unchanged and all secondary labels remain legible.
• Light: the count, group headings, (you) label, and screen descriptions render clearly against the white submenu.
• The dropdown remains aligned and all five seeded users are visible without clipping.

Fresh

Light

The computed Light-scheme text color is rgb(80, 87, 94) (#50575e) against rgb(255, 255, 255), a 7.33:1 contrast ratio.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Unlinked Accounts

The following contributors have not linked their GitHub and WordPress.org accounts: @akira-in-tech.

Contributors, please read how to link your accounts to ensure your work is properly credited in WordPress releases.

Core Committers: Use this line as a base for the props when committing in SVN:

Props joefusco.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[josephfusco]

Hey @akira-in-tech, thank you for working on this. Confirmed this resolves the contrast issue.

One thing: please link a WordPress.org account so you get proper credit when this ships.

[akira-in-tech]

Thanks for confirming the fix and for the attribution reminder. I’ll take care of linking my WordPress.org account so the contribution is credited correctly.