fix(release): bump to 4.2.0 so the scrollbar removal ships

[tmccoy14]

Why

The scrollbar removal from #150 is on main, built and correct, but has never been published. Everything downstream still installs the pre-removal artifact.

What happened, from the commit dates:

• Sep 21 — 1a06cf5 "bump equality version" set 4.0.0 → 4.1.0 on main. That touched packages/ui/package.json, which fired publish.yaml. npm had no 4.1.0, so CI built main as it stood that day — before the removal — and published it.
• Sep 22 — feat: depreceate scroll-area component and styled scrollbars #150 squash-merged the removal. Its only change to package.json was adding CHANGELOG.md to files; the version stayed 4.1.0. The workflow fired, found 4.1.0 already on npm, and hit the "version already exists; skipping publish" guard.

So published 4.1.0 still carries styled-vertical-scrollbar and styled-horizontal-scrollbar, still ships theme-components.css, and still applies the vertical utility to DialogContent and SheetContent.

Downstream effect

Anyone who follows the migration guide today ends up with mismatched scrollbars: native everywhere they migrated, and the restyled 6px #7f738f bar inside Dialog and Sheet, which are the only two components the library applies that class to. That is how this surfaced — guardian/apps/studio migrated its five <ScrollArea /> usages and the dialogs no longer match the rest of the app.

What this changes

One line: packages/ui/package.json 4.1.0 → 4.2.0. No source changes — main is already correct. 4.2.0 is the version the CHANGELOG entry from #150 already names, and it is unpublished on npm.

publish.yaml triggers on a push to main touching packages/ui/package.json, and pnpm run release builds before publishing, so merging this ships a fresh build.

Verification

Against a clean rm -rf dist && pnpm run build:

• no styled-vertical-scrollbar / styled-horizontal-scrollbar anywhere in dist
• no theme-components.css, and no stylesheet left @import-ing it (a dangling import would break every consumer's CSS build)
• DialogContent renders cn(styles["dialog-body"], className) only
• .dialog-body keeps overflow: auto, so dialog bodies still scroll — just with the native bar
• ScrollArea / ScrollBar still exported, carrying their @deprecated JSDoc — deprecated, not removed

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