Fix #1035: refresh extension tab metadata after navigation

[roshanasingh4]

Fixes #1035.

Problem

• For the Chrome extension profile (driver: extension), browser tabs reads metadata from the relay server’s /json/list.
• The relay cached target metadata from Target.attachedToTarget and never updated it, so after navigation the tab’s title/url in /json/list remained stale even though navigation + snapshots worked.

Fix

• Handle Target.targetInfoChanged events in src/browser/extension-relay.ts and update the cached targetInfo for the matching targetId, keeping /json/list fresh.

Tests

• Extend src/browser/extension-relay.test.ts with a regression that simulates Target.targetInfoChanged and asserts /json/list reflects updated title/url.

[steipete]

Landed on main via rebase.

Commits:

• 693f152 Fix browser tabs CLI shows stale title/URL after navigation (chrome extension profile) #1035: refresh extension tab metadata
• 410b8f2 fix: keep extension relay list current (Fix #1035: refresh extension tab metadata after navigation #1073) — adds /json/list wait in src/browser/extension-relay.test.ts, updates CHANGELOG.md, cleans hooks-cli strings

Tests: pnpm lint && pnpm build && pnpm test (build failed: src/media-understanding/attachments.ts TS2322 "document" not assignable; tests not run).

Thanks @roshanasingh4!