www/remark42: build frontend with pnpmHEADmain

- Switch to USES=npm:pnpm so the frontend is built from upstream's
  pnpm-lock.yaml (frozen, offline, no lifecycle scripts) instead of
  an npm-resolved dependency set.
- Follow the default Node.js version instead of hardcoding node24.
- Relax the Go requirement to 1.27+.
- Fetch the prefetch distfiles from MASTER_SITES before the framework
  regenerates them, and recompress the node modules archive with xz.
- Drop the TypeScript patch, no longer needed with upstream's
  locked dependency versions.
- Remove unused variables and reorder per portclippy.

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