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gsxdsm 49c2de108b test(dashboard): harden hook tests + drop dead App.tsx re-exports (code review)

Address code-review findings on the App.tsx module-breakup:
- Add behavior-preservation tests: useBoardScrollRestore real double-rAF
  restore path; useApprovalBanner clear-on-leave-awaiting + mailbox-refresh
  dedup; useCapacityRiskBanner threshold-change-clears + dismiss-persist
  assertion; useChatUnreadBadge room-message + cross-project filter; and a
  new sseSplitIntegration test co-mounting useMailboxUnread + useApprovalBanner
  to pin the KTD4 SSE split (no double-fire; awaiting-approval refresh exactly
  once via callback).
- Add unmount/teardown assertions (stash interval clear, auth-token listener
  removal, dashboard-health cancelled flag).
- Drop dead type-only re-exports (ApprovalBannerCandidate, CliActionDeps) from
  App.tsx — zero importers (verified).

All hook tests green; App.test.tsx unchanged (5 pre-existing). typecheck +
eslint clean. No production behavior change.

2026-06-24 01:13:33 -07:00