feat(ui-components): add accessibility testing to storybook

[ovflowd]

Description

This PR adds Storybook's accessibility addon (@storybook/addon-a11y) to the ui-components Storybook, so every Story gets checked by axe-core against WCAG rules and the results show up in the new Accessibility panel.

• Registered the addon in .storybook/main.ts
• Set parameters.a11y.test to 'todo' in .storybook/preview.tsx, so violations surface as warnings instead of failures while we work through the existing ones

I didn't wire it into CI here. Since we're on the webpack builder, the Vitest addon path isn't available to us, so enforcement would come either from Chromatic's accessibility tests (a project setting, no repo change) or from @storybook/test-runner. Happy to do either as a follow-up, and to flip test to 'error' once the current violations are fixed.

The extra churn in pnpm-lock.yaml is pnpm pruning stale entries (e.g. eslint-plugin-import) once the importer changed.

Validation

Run pnpm storybook in packages/ui-components and open the Accessibility tab on any Story. storybook:build, tsc, ESLint and the unit tests all pass locally.

Related Issues

N/A

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated
nodejs-org	Ready	Preview	Oct 5, 2026 8:42pm UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.05%. Comparing base (e7bbce7) to head (960e8b2).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9205      +/-   ##
==========================================
- Coverage   86.07%   86.05%   -0.02%     
==========================================
  Files          86       86              
  Lines        6060     6060              
  Branches      359      359              
==========================================
- Hits         5216     5215       -1     
- Misses        840      841       +1     
  Partials        4        4              

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[MattIPv4]

Needs a changeset add --empty, but otherwise 🙌 love to see some a11y love.

[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	7.15 MB
New Total First Load JS	7.15 MB
Delta	0 B (0.00%)