Extracts buildQrUrl and generateZoneQrs with injectable I/O deps and adds
tests/scripts/generate-qr.test.ts (20 tests). Refactor + tests originated
from a concurrent working session; this commit adds on top:
- import.meta entry guard — the unconditional top-level main() executed on
test import and wrote (sometimes truncated) PNGs into public/qr
- typed vi.fn generics in makeDeps so strict tsc passes
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ
