PR #165 fixed the one real strict-undefined error in SegmentedRing.tsx;
the other ~30 errors reported in CI run 25797533005 were downstream of
`TS2307: Cannot find module '@jarvis/bus'` and resolve automatically
once `scripts/build-webview.sh` produces the bus package's
`dist/index.d.ts` (which CI already runs before typecheck).
Removes `continue-on-error: true` from the Typecheck step so typecheck
regressions block CI going forward.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>