Extract three more AppInner state clusters into hooks:
- useDashboardHealth: dashboard health state + mount fetch + on-demand refresh;
exposes setHealth for the TaskIdIntegrityBanner remediation callback.
- useAuthTokenRecovery: the auth-token-recovery dialog open state driven by the
AUTH_TOKEN_RECOVERY_REQUIRED_EVENT window listener.
- useScopedDismissFlag: a generic per-project dismissable banner flag (scoped
storage + project-change re-read + dismiss); backs the setup-warning banner.
Capacity-risk dismiss stays inline pending its dedicated useCapacityRiskBanner
hook. Behavior-preserving; App.test.tsx identical (5 pre-existing failures,
none introduced). Verified by typecheck, eslint, and 7 renderHook tests.
Part of U5 (App.tsx module-breakup plan).
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