fix(relay): keep stale routes from closing pairing

[zikolach]

Summary

• prevent stale route-local notifications from closing a newer active pairing QR screen
• keep pairing QR teardown after route live-context verification
• add integration coverage for stale route notification versus active route notification

Validation

• npm run typecheck
• npm test

OpenSpec validation skipped: follow-up bugfix is not tied to an active OpenSpec implementation change.

[Copilot]

Pull request overview

This PR fixes relay pairing QR teardown so stale route-local notifications no longer close a newer active pairing screen, while preserving teardown when the active route reports a pairing notification.

Changes:

• Moved QR screen closure until after route live-context verification.
• Added integration coverage for stale versus active route-local notifications affecting pairing UI.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
extensions/relay/runtime/extension-runtime.ts	Ensures notifyLocal only closes the active pairing QR screen after confirming the route still has a live context.
tests/integration.test.ts	Extends stale route-local action coverage to verify stale notifications do not close the active QR screen, while active notifications do.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.