chore: sync StackBlitz to 1.0.0-beta.5 - #47

What changed

• Pin the standalone StackBlitz lab to the published [email protected].
• Refresh only the matching frozen lockfile entries and npm integrity.

Validation

• pnpm verify:stackblitz
• Development transform, source map, and clean production build all pass against the public npm package.
• Lockfile integrity matches the npm official registry attestation metadata.
• Independent review found no issues.