refactor(grades,diagnostic): 完成成绩和学情诊断模块审计 P1+P2 改进项
P1-1: 抽取 stats-service.ts,将 8 个统计计算纯函数从 data-access 层分离 P1-5: 创建 WidgetBoundary 组件 + 补齐 teacher 路由 loading.tsx/error.tsx (14 文件) P1-6: 同步架构图文档 004/005,新增 stats-service 与 widget-boundary 节点 P2-1: 补充 a11y ARIA 属性(5 图表 role=img + aria-label,2 表格 caption,3 列表 role=list,3 按钮 aria-label) P2-3: 修复班级报告 studentId 字段语义错误(schema 改为可空 + 迁移 + 代码适配) P2-4: 修复 grade_managed scope 返回空数据(改为子查询 classes 表按 gradeId 过滤) P2-5: 新增 /parent/diagnostic/ 页面(多子女学情诊断聚合 + loading + error) P2-6: 统一 SearchParams 工具(student/grades 和 management/grade/insights 改用 @/shared/lib/search-params)
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src/app/(dashboard)/teacher/diagnostic/loading.tsx
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src/app/(dashboard)/teacher/diagnostic/loading.tsx
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import { Card, CardContent, CardHeader } from "@/shared/components/ui/card"
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import { Skeleton } from "@/shared/components/ui/skeleton"
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export default function Loading() {
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return (
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<div className="space-y-6">
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<div className="space-y-2">
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<Skeleton className="h-8 w-48" />
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<Skeleton className="h-4 w-64" />
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</div>
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<Card>
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<CardHeader>
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<Skeleton className="h-5 w-40" />
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</CardHeader>
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<CardContent className="space-y-3">
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{Array.from({ length: 5 }).map((_, i) => (
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<Skeleton key={i} className="h-12 w-full" />
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))}
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</CardContent>
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</Card>
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</div>
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)
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}
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