P1.6 closed: shared/state.ts is type-checked end to end. StateHost
interface defines every field; double-registration throws; vitest gets
__resetHostForTests to break inter-test leakage. View + PopupState moved
to shared/popup-state.ts (broke the popup→shared circular-dep blocker).
PopupState widened to absorb VaultState's vault-tab-only fields (unlocked,
drawerOpen, typePanelOpen) with optional + commented justification, so the
two surfaces share one typed contract.
378/378 vitest tests pass (baseline 371 + 7 new state.test.ts cases).
Phase 5 still running in parallel. Cross-stream note from Phase 1 subagent:
settings.ts was not touched here, so Phase 5's teardownSettingsCommon
extraction rebases cleanly.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
c3f8e3541c