test(wizard): implement e2e integration flow tests

[johdanike]

🎯 Goal

Test the navigation logic and ensure formData persistence across all wizard steps from initialization to the final review screen.

📋 Technical Scope & Changes

• Created wizard-flow.test.tsx.
• Implemented an integration testing approach using the actual useWizardStore rather than a mock.
• Created dummy representations of Steps 1-3 to simulate user interactions without triggering complex browser APIs (like drag-and-drop or FileReader).
• Rendered the real ReviewSubmitStep at Step 4 to assert that data inputted in previous steps correctly renders in the final DOM.
• Added a beforeEach block to reset the Zustand store state, preventing test leakage.
• Mocked @stellar/freighter-api and verificationService to prevent CI hanging on blockchain calls.

✅ Acceptance Criteria

• Use React Testing Library to click through step 1 to step 4.
• Assert data is carried over in the DOM and the Zustand store.
• Tests pass in CI. (Pending)

Closes #441

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[Tybravo]

@johdanike
Please fix the CI build and check to pass. Thank you