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/app/parent/dashboard/page.tsx

@@ -1,9 +1,143 @@
 // 仪表盘页面
-// 依据：02-architecture-design.md §3.1 路由结构
+// 依据：02-architecture-design.md §3.1 路由结构、§15 仪表盘设计
 // 路由：/parent/dashboard
+// - 多子女并列展示 ChildSummaryCard
+// - 顶部关注横幅（逾期作业 / 出勤率低预警）
+// - 当前选中子女的考勤日历
 
-import { ParentDashboard } from "@/components/ParentDashboard";
+"use client";
+
+import { useState, useCallback, useEffect } from "react";
+import { useChildSwitcher } from "@/hooks/useChildSwitcher";
+import { useChildSummary } from "@/hooks/useChildSummary";
+import { useChildAttendance } from "@/hooks/useChildAttendance";
+import { ChildSummaryCard } from "@/components/ChildSummaryCard";
+import { AttendanceCalendar } from "@/components/AttendanceCalendar";
+import { ParentAttentionBanner } from "@/components/ParentAttentionBanner";
+import type { ChildInfo, ChildSummary } from "@/types";
 
 export default function DashboardPage() {
-  return <ParentDashboard />;
+  const { children, currentChild, loading } = useChildSwitcher();
+  const { attendance, loading: attLoading } = useChildAttendance();
+  const [summaries, setSummaries] = useState<Record<string, ChildSummary>>({});
+
+  const handleSummaryLoaded = useCallback(
+    (childId: string, summary: ChildSummary) => {
+      setSummaries((prev) => {
+        if (prev[childId]?.avgScore === summary.avgScore) return prev;
+        return { ...prev, [childId]: summary };
+      });
+    },
+    [],
+  );
+
+  if (loading) {
+    return (
+      <div className="space-y-4">
+        <span className="skeleton h-8 w-full rounded" />
+        <span className="skeleton h-32 w-full rounded" />
+        <span className="skeleton h-48 w-full rounded" />
+      </div>
+    );
+  }
+
+  if (children.length === 0) {
+    return (
+      <p className="rounded border border-rule bg-paper-elevated p-4 text-sm text-ink-muted">
+        暂无绑定子女
+      </p>
+    );
+  }
+
+  const attentionItems = children.map((c) => ({
+    childId: c.id,
+    childName: c.name,
+    pendingHomeworkCount: summaries[c.id]?.pendingHomeworkCount ?? 0,
+    attendanceRate: summaries[c.id]?.attendanceRate ?? 1,
+  }));
+
+  return (
+    <div className="space-y-6">
+      <ParentAttentionBanner items={attentionItems} />
+
+      <h1 className="font-serif text-2xl">学习概览</h1>
+
+      {/* 多子女并列卡片 */}
+      <div className="grid grid-cols-1 gap-6 lg:grid-cols-2">
+        {children.map((child) => (
+          <ChildDashboardCard
+            key={child.id}
+            child={child}
+            onSummaryLoaded={handleSummaryLoaded}
+          />
+        ))}
+      </div>
+
+      {/* 当前选中子女的考勤日历 */}
+      {currentChild && (
+        <div>
+          <h2 className="mb-3 font-serif text-lg">{currentChild.name}的考勤</h2>
+          {attLoading ? (
+            <span className="skeleton h-64 w-full rounded" />
+          ) : (
+            <AttendanceCalendar records={attendance} />
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+// 子女仪表盘卡片：独立获取每个子女的 summary
+function ChildDashboardCard({
+  child,
+  onSummaryLoaded,
+}: {
+  child: ChildInfo;
+  onSummaryLoaded: (childId: string, summary: ChildSummary) => void;
+}) {
+  const { summary, loading, error } = useChildSummary(child.id);
+
+  useEffect(() => {
+    if (summary) {
+      onSummaryLoaded(child.id, summary);
+    }
+  }, [summary, child.id, onSummaryLoaded]);
+
+  if (loading) {
+    return (
+      <div className="space-y-4">
+        <h2 className="font-serif text-lg">{child.name}</h2>
+        <span className="skeleton h-32 w-full rounded" />
+        <span className="skeleton h-48 w-full rounded" />
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div>
+        <h2 className="mb-2 font-serif text-lg">{child.name}</h2>
+        <div className="rounded border border-danger p-4 text-sm text-danger">
+          加载失败：{error.message}
+        </div>
+      </div>
+    );
+  }
+
+  if (!summary) {
+    return (
+      <div>
+        <h2 className="mb-2 font-serif text-lg">{child.name}</h2>
+        <p className="text-sm text-ink-muted">暂无数据</p>
+      </div>
+    );
+  }
+
+  return (
+    <div>
+      <h2 className="mb-3 font-serif text-lg">{child.name}</h2>
+      <ChildSummaryCard summary={summary} />
+    </div>
+  );
 }