The KimiSponsorBanner (use client) version gate imported isNewer/normalizeVersion
from versionCheck.ts, whose top-level 'import { execFile } from child_process'
cannot be tree-shaken out of a client bundle — Turbopack next build failed with 33
'Module not found' errors (child_process, fs, net, dns, module). Move the pure
helpers to a dependency-free versionCompare.ts; versionCheck.ts re-exports them.
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
