build: move to Rolldown and TypeScript 7

[birkskyum]

Summary

• replace Rollup with Rolldown and use its native module resolution, CommonJS handling, and output cleanup
• bundle declarations with rolldown-plugin-dts
• update TypeScript to 7.0.2, Vitest to 4.1.11, and pnpm to 11.22.0
• replace @skypack/package-check with Publint and Are the Types Wrong
• add a patch changeset

Validation

• pnpm build
• pnpm test
• pnpm check
• pnpm exec prettier --check package.json tsconfig.json rolldown.config.js pnpm-workspace.yaml .github/workflows/ci.yml .github/workflows/release.yml .changeset/modern-toolchain.md src/css.d.ts

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​rolldown/​plugin-babel@​0.2.3
	rolldown@​1.2.4
	vitest@​4.1.11
	publint@​0.3.23
	@​arethetypeswrong/​cli@​0.18.5
	typescript@​7.0.2
	babel-preset-solid@​2.0.0-rc.1 ⏵ 2.0.0-rc.0	+1			+1
	solid-js@​2.0.0-rc.1 ⏵ 2.0.0-rc.0
	rolldown-plugin-dts@​0.28.2

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm highlight.js is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: pnpm-lock.yaml → npm/@arethetypeswrong/cli@0.18.5 → npm/highlight.js@10.7.3 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/highlight.js@10.7.3. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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