[Phase 4.2] Assessment Mode Refinement

[robinson]

Goal

Polish and extend the Assessment interaction mode with structured question types,
timer support, and a results summary screen.

Scope

• Question types: multiple-choice, fill-in-the-blank, free-text (AI-graded),
  true/false, matching pairs.
• Optional timer widget (student-controlled; no automatic timeout).
• Results summary: score, per-question breakdown, AI explanation for wrong answers.
• "Try again" flow with different question variants.
• Export results to PDF for teacher review.

Acceptance Criteria

• All 5 question types render and record answers correctly.
• Timer is optional and can be dismissed at any time.
• Results screen shows correct answers + explanations for incorrect ones.
• Results exportable to PDF.
• No assessment data is sent to external servers (local-first).

References

• docs/UX_REDESIGN_STRATEGY.md — Part 4: AI Interaction (Assessment Mode)

Phase

Phase 4 — Advanced Features & Polish · Week 3–5