Summary

• Add an active-tab-only startup metadata reconcile loop when the frontend still sees ready=false without a startup error.
• Guard the loop with a per-tab token so tab switches, startup errors, backend activation, or readiness invalidate stale probes.
• Keep the probe read-only: it calls only MetaForTab for the active tab and does not activate tabs, reload history, rebuild controllers, or toggle approval mode.
• Add a regression test for the missed-ready-event path that previously made toggling approval mode appear to unlock send.

Verification

• cd desktop/frontend && npx tsx src/__tests__/ready-meta-reconcile.test.tsx
• cd desktop/frontend && npx tsx src/__tests__/ready-event-meta-sync.test.tsx
• cd desktop/frontend && npm run test:typecheck
• cd desktop/frontend && npm run test
• cd desktop/frontend && npm run build
• cd desktop && go test -short .
• git diff --check