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- Add QuizQuestionType Swift enum with safe factory and displayAnswer - Add QuizQuestion.questionType computed property - Replace bare string comparisons with enum switch in QuizTakerView - Add empty state, unknown type error state, judge localization - Use displayAnswer in QuizResultView for choice index→text + judge CN - Add QuizQuestionTypeTests (19 tests) - Update QuizService with createAttempt/getAttemptQuestions endpoints Co-Authored-By: Claude <noreply@anthropic.com>