题库导入功能完成，考试计划功能完成。

openspec/changes/fix-quizpage-useeffect-bug/proposal.md

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+# Change: Fix QuizPage useEffect Bug
+
+## Why
+在QuizPage.tsx中，useEffect钩子末尾错误地调用了clearQuiz()函数，导致从SubjectSelectionPage传递过来的题目数据被立即清除，引发"Cannot read properties of undefined (reading 'type')"错误。
+
+## What Changes
+- 移除QuizPage.tsx useEffect钩子末尾的clearQuiz()调用
+- 修改清除逻辑，只清除answers对象而保留题目数据
+- 添加对currentQuestion的空值检查，确保组件正确渲染
+
+## Impact
+- Affected specs: quiz
+- Affected code: src/pages/QuizPage.tsx

openspec/changes/fix-quizpage-useeffect-bug/specs/quiz/spec.md

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+## MODIFIED Requirements
+### Requirement: Quiz Page State Management
+The system SHALL preserve question data when navigating to QuizPage from other pages, and only clear答题状态(answers) to ensure proper component rendering.
+
+#### Scenario: Navigation from SubjectSelectionPage
+- **WHEN** user selects a subject and navigates to QuizPage
+- **THEN** the system SHALL preserve the questions data
+- **THEN** the system SHALL clear only the answers state
+- **THEN** the system SHALL render the first question correctly
+
+### Requirement: Quiz Page Error Handling
+The system SHALL properly handle null or undefined question data to prevent runtime errors during rendering.
+
+#### Scenario: Null Question Data
+- **WHEN** currentQuestion is null or undefined
+- **THEN** the system SHALL display a loading state instead of crashing
+- **THEN** the system SHALL NOT attempt to access properties of undefined objects

openspec/changes/fix-quizpage-useeffect-bug/tasks.md

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+## 1. Implementation
+- [x] 1.1 移除QuizPage.tsx useEffect钩子末尾的clearQuiz()调用
+- [x] 1.2 修改清除逻辑，只清除answers对象而保留题目数据
+- [x] 1.3 添加对currentQuestion的空值检查，确保组件正确渲染
+
+## 2. Validation
+- [x] 2.1 运行项目确保bug已修复
+- [x] 2.2 验证从SubjectSelectionPage可以正常跳转到QuizPage并显示题目