feat(parent-portal): 完成参考项目(CICD)家长端功能全量覆盖 - 9 新页面 + 3 页面增强 + 763 测试通过

## 变更内容

### P0 高优先级新页面
- /parent/leave: 请假表单(react-hook-form + Zod) + 历史列表(状态筛选)
- /parent/grades/report-card: 报告卡(学年/学期筛选 + 打印 + 教师评语)
- /parent/children/[studentId]: 子女详情聚合页(5 Tab: overview/homework/grades/exams/schedule)

### P1 中优先级新页面
- /parent/error-book: 错题本(5 项统计 + Top 错题 + 薄弱知识点)
- /parent/diagnostic: 诊断报告(掌握度摘要 + 已发布诊断报告)
- /parent/practice: 练习统计(4 项统计 + 练习历史)

### P2 低优先级新页面
- /parent/course-plans + [id]: 课程计划列表 + 详情(章节列表)
- /parent/lesson-plans + [planId]/view: 备课列表(学科筛选) + 只读详情
- /parent/elective: 选修课(分类色点 + 状态徽标)

### P3 现有页面增强
- /parent/dashboard: ParentAttentionBanner + 多子女卡片网格 + 趋势图标 + 逾期高亮
- /parent/attendance: AttendanceRateCard + AttendanceWarningBanner + 月份导航
- /parent/grades: GrowthArchiveChart + ExportGradesButton + 班级均对比线

### 基础设施
- types/index.ts: +20 新类型(LeaveRequest/ReportCard/ErrorBookStats/DiagnosticReport/PracticeStats/CoursePlan/LessonPlan/ElectiveSelection/ChildDetail/ScheduleItem 等)
- operations.ts: +19 GraphQL operations(17 query + 2 mutation)
- fixtures.ts: +18 mock 数据集
- handlers.ts: +19 MSW GraphQL handler

### 质量校验
- typecheck: 0 错误
- lint: 0 错误
- test: 71 文件 / 763 测试全部通过(从 413 增至 763, +350 测试)

### 文档
- workline.md: 新增 §7 参考项目(CICD)差距分析与实现安排 + §7.3-7.5 实现进度与覆盖完成度

### 设计决策
- 保留当前"单子女切换"范式(MultiChildTabBar + useChildSwitcher),不迁移到"多子女同屏对比"
- 仪表盘除外:已增强为多子女卡片网格并列展示
- 参考项目所有 11 个家长端页面功能已 100% 覆盖

Refs: ARB-020 §22, ARB-022 §24.4

apps/parent-portal/src/components/CoursePlanDetail.tsx

@@ -0,0 +1,125 @@
+// CoursePlanDetail：课程计划详情（基本信息 + 章节列表）
+// 依据：02-architecture-design.md §15 组件设计
+// 章节：标题/描述/排序/课时数/预计学时
+
+"use client";
+
+import type { CoursePlanDetail } from "@/types";
+import { cn, formatDate } from "@/lib/utils";
+
+interface CoursePlanDetailProps {
+  coursePlan: CoursePlanDetail;
+}
+
+type CoursePlanStatus = CoursePlanDetail["status"];
+
+const STATUS_LABELS: Record<CoursePlanStatus, string> = {
+  active: "进行中",
+  completed: "已完成",
+  archived: "已归档",
+};
+
+const STATUS_STYLES: Record<CoursePlanStatus, string> = {
+  active: "text-success",
+  completed: "text-ink-muted",
+  archived: "text-ink-muted",
+};
+
+export function CoursePlanDetail({
+  coursePlan,
+}: CoursePlanDetailProps): JSX.Element {
+  const chapters = [...coursePlan.chapters].sort(
+    (a, b) => a.sortOrder - b.sortOrder,
+  );
+
+  return (
+    <article className="space-y-6">
+      {/* 基本信息 */}
+      <section
+        aria-label="课程计划基本信息"
+        className="rounded border border-rule bg-paper-elevated p-4"
+      >
+        <div className="flex items-start justify-between gap-3">
+          <div className="min-w-0 flex-1">
+            <span className="rounded bg-accent-soft px-2 py-0.5 text-xs text-ink">
+              {coursePlan.subject}
+            </span>
+            <h2 className="mt-2 font-serif text-xl">{coursePlan.title}</h2>
+            <p className="mt-2 text-sm text-ink-muted">
+              {coursePlan.description}
+            </p>
+          </div>
+          <span
+            className={cn(
+              "flex-shrink-0 text-xs font-medium",
+              STATUS_STYLES[coursePlan.status],
+            )}
+          >
+            {STATUS_LABELS[coursePlan.status]}
+          </span>
+        </div>
+
+        <div className="mt-4 border-t border-rule pt-3">
+          <dl className="grid grid-cols-2 gap-y-3 text-sm sm:grid-cols-4">
+            <div>
+              <dt className="text-xs text-ink-muted">班级</dt>
+              <dd className="mt-1">{coursePlan.className}</dd>
+            </div>
+            <div>
+              <dt className="text-xs text-ink-muted">教师</dt>
+              <dd className="mt-1">{coursePlan.teacherName}</dd>
+            </div>
+            <div>
+              <dt className="text-xs text-ink-muted">起止日期</dt>
+              <dd className="mt-1">
+                {formatDate(coursePlan.startDate)} ~{" "}
+                {formatDate(coursePlan.endDate)}
+              </dd>
+            </div>
+            <div>
+              <dt className="text-xs text-ink-muted">章节数</dt>
+              <dd className="mt-1 font-mono">{coursePlan.chapterCount}</dd>
+            </div>
+          </dl>
+        </div>
+      </section>
+
+      {/* 章节列表 */}
+      <section aria-label="章节列表" className="space-y-3">
+        <h3 className="font-serif text-base">章节安排</h3>
+        <ol className="space-y-3">
+          {chapters.map((chapter) => (
+            <li
+              key={chapter.id}
+              className="rounded border border-rule bg-paper-elevated p-4"
+            >
+              <div className="flex items-start justify-between gap-3">
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2">
+                    <span className="font-mono text-xs text-ink-muted">
+                      第 {chapter.sortOrder} 章
+                    </span>
+                  </div>
+                  <h4 className="mt-1 font-serif text-base">{chapter.title}</h4>
+                  <p className="mt-1 text-sm text-ink-muted">
+                    {chapter.description}
+                  </p>
+                </div>
+                <div className="flex-shrink-0 text-right">
+                  <div className="font-mono text-sm">
+                    {chapter.lessonCount} 课时
+                  </div>
+                  <div className="mt-1 text-xs text-ink-muted">
+                    预计 {chapter.estimatedHours} 学时
+                  </div>
+                </div>
+              </div>
+            </li>
+          ))}
+        </ol>
+      </section>
+    </article>
+  );
+}
+
+export default CoursePlanDetail;