[bprusinowski]

Part of the GitLab a11y audit. Fixes issues 131, 125, 129 and the focus part of 124.

This PR:

• adds one visible focus ring (federal design system purple) for keyboard focus across buttons, links, tabs, menu items, inputs and sliders
• gives the switch sufficient contrast
• keeps switches, tabs and selected states visible in forced colors (high contrast) mode

How to test

1. Tab through the home page, browse page and the chart editor: every stop shows a purple ring.
2. In Chrome DevTools → Rendering, enable "forced-colors: active" and repeat.
3. Run yarn test themes and npx playwright test e2e/keyboard-focus.spec.ts.

---

• I added a CHANGELOG entry
• I made a self-review of my own code
• I wrote tests for the changes (if applicable)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
visualization-tool	Error		Nov 13, 2026 1:13pm UTC