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Phase 4a: Add @testing-library/react, user-event, jest-dom, jsdom. Switch vitest environment to jsdom, add setup file, create test-utils with QueryClient wrapper. Phase 4b: Extract ProjectWizard form logic into project-wizard/ subdir: - types.ts: WizardState, Assignment, constants, factory functions - useProjectWizardForm.ts: form state hook + canGoNext pure function Phase 4c: 32 tests for canGoNext validation (all 5 steps), makeDefaultState, and makeReq factory function. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>