chore: remove unused devDependencies

[reidbarber]

Removes unused dev dependencies across the repo. No runtime code changes.

Root package.json:

Package	Reason
is-mingw, walk-object	No references anywhere in the repo.
@vitest/browser-preview	browser config uses @vitest/browser-playwright.
@storybook/addon-themes	Not registered in any .storybook*/main addons list.
@parcel/reporter-bundle-analyzer	Not referenced in any .parcelrc, script, or CI workflow.
eslint-plugin-jest	Repo now lints with oxlint (native jest plugin), no ESLint config exists.
regenerator-runtime	Nothing imports it and no babel config references it.

---

Workspace packages:

Package	Removed	Reason
@parcel/transformer-s2-icon	prettier	Redundant devDep, already a real dependencies entry.
@react-spectrum/ai	@storybook/jest, @react-aria/test-utils, @testing-library/dom, @testing-library/react	Unreferenced; tests use @react-spectrum/test-utils-internal + vitest-browser-react + @testing-library/user-event (kept).
@react-spectrum/toast, @react-stately/toast	@types/use-sync-external-store	use-sync-external-store is neither imported nor a dependency.
@react-spectrum/contextualhelp	@react-spectrum/link, @react-spectrum/view	No references in the package.
react-aria-components	@tailwindcss/postcss	No tailwind/postcss usage; the plugin lives in tailwindcss-react-aria-components.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Smoke test

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[rspbot]

Agent Skills Changes

Modified (2)

• react-aria/skills/react-aria/references/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$
• s2/skills/react-spectrum-s2/references/react-aria/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$

Install

React Spectrum S2:

npx skills add https://d1pzu54gtk2aed.cloudfront.net/pr/b49d06235bfb39c20fc2b7c73442c39d2175abfd/

React Aria:

npx skills add https://d5iwopk28bdhl.cloudfront.net/pr/b49d06235bfb39c20fc2b7c73442c39d2175abfd/

[snowystinger]

removed a little too much, yarn install has a new line item now

@react-spectrum/ai@workspace:packages/@react-spectrum/ai doesn't provide @testing-library/dom (p837d16), requested by @testing-library/user-event.

[snowystinger]

we should have a script target for running this one, it can be useful

[snowystinger]

this one should be deduped, the last time i tried to run yarn dedupe though things broke, so maybe just target this one, we can do the full dedupe later

[snowystinger]

how'd we end up with a newer prettier? i guess the devDep was pulling it down, we should probably just use the 3.8.1 version we already have or dedupe to the higher