Problem
C6 finding from PR #13 review: if user opens /measure (no extension), installs extension in another tab, then comes back to /measure tab without reload, the page is permanently stuck at NoBackendGuide. The instruction step 5 says 'Reload this page' but users who don't read it are confused.
Proposal
Add light polling fallback. While backend.kind === 'none' AND document.visibilityState === 'visible', re-run detectExtensionOnly() every 5 seconds. Stop polling on first hit OR after 60 seconds.
Cost: ~2KB code. Network: extension ping is in-process (no network).
Scope
apps/website/app/measure/page.tsx: add second useEffect for poll- Pause when document.visibilityState !== 'visible' to avoid wasted cycles in background tabs
Risk: LOW. Additive; doesn't change existing fast-path.
Acceptance: install extension → switch back to /measure → within 5s sees 'Extension Ready' badge without reload.
Source: Session 2026-05-22 weakness analysis A4.
Problem
C6 finding from PR #13 review: if user opens /measure (no extension), installs extension in another tab, then comes back to /measure tab without reload, the page is permanently stuck at NoBackendGuide. The instruction step 5 says 'Reload this page' but users who don't read it are confused.
Proposal
Add light polling fallback. While
backend.kind === 'none'ANDdocument.visibilityState === 'visible', re-rundetectExtensionOnly()every 5 seconds. Stop polling on first hit OR after 60 seconds.Cost: ~2KB code. Network: extension ping is in-process (no network).
Scope
apps/website/app/measure/page.tsx: add second useEffect for pollRisk: LOW. Additive; doesn't change existing fast-path.
Acceptance: install extension → switch back to /measure → within 5s sees 'Extension Ready' badge without reload.
Source: Session 2026-05-22 weakness analysis A4.