feat(app): add error/loading boundaries and update dashboard routes

- Add error.tsx and loading.tsx boundaries for admin, parent, student, teacher routes

- Add dashboard-error-fallback and dashboard-loading-skeleton components

- Add student/learning page, parent/leave routes, teacher textbook components

- Update existing app routes across auth, dashboard, and API endpoints

- Update proxy middleware and next-auth type declarations

src/app/(dashboard)/parent/children/[studentId]/loading.tsx

@@ -0,0 +1,45 @@
+import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
+import { Skeleton } from "@/shared/components/ui/skeleton"
+
+export default function Loading() {
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center gap-4">
+        <Skeleton className="h-16 w-16 rounded-full" />
+        <div className="space-y-2">
+          <Skeleton className="h-7 w-40" />
+          <Skeleton className="h-4 w-56" />
+        </div>
+      </div>
+
+      <Skeleton className="h-9 w-full max-w-md" />
+
+      <div className="grid grid-cols-1 gap-4 md:grid-cols-2 lg:grid-cols-3">
+        <Card className="lg:col-span-2">
+          <CardHeader>
+            <CardTitle className="text-base">
+              <Skeleton className="h-4 w-32" />
+            </CardTitle>
+          </CardHeader>
+          <CardContent className="space-y-3">
+            {Array.from({ length: 4 }).map((_, i) => (
+              <Skeleton key={i} className="h-12 w-full" />
+            ))}
+          </CardContent>
+        </Card>
+        <Card>
+          <CardHeader>
+            <CardTitle className="text-base">
+              <Skeleton className="h-4 w-32" />
+            </CardTitle>
+          </CardHeader>
+          <CardContent className="space-y-3">
+            {Array.from({ length: 4 }).map((_, i) => (
+              <Skeleton key={i} className="h-10 w-full" />
+            ))}
+          </CardContent>
+        </Card>
+      </div>
+    </div>
+  )
+}

src/app/(dashboard)/parent/children/[studentId]/page.tsx

@@ -1,9 +1,17 @@
 import { notFound } from "next/navigation"
 
 import { requireAuth } from "@/shared/lib/auth-guard"
-import { verifyParentChildRelation, getChildDashboardData } from "@/modules/parent/data-access"
+import { getSearchParam } from "@/shared/lib/utils"
+import {
+  verifyParentChildRelation,
+  getChildDashboardData,
+  getChildNameList,
+} from "@/modules/parent/data-access"
 import { ChildDetailHeader } from "@/modules/parent/components/child-detail-header"
-import { ChildDetailPanel } from "@/modules/parent/components/child-detail-panel"
+import {
+  ChildDetailPanel,
+  SiblingSwitcher,
+} from "@/modules/parent/components/child-detail-panel"
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { ShieldAlert } from "lucide-react"
 
@@ -11,10 +19,13 @@ export const dynamic = "force-dynamic"
 
 export default async function ChildDetailPage({
   params,
+  searchParams,
 }: {
   params: Promise<{ studentId: string }>
+  searchParams: Promise<{ [key: string]: string | string[] | undefined }>
 }) {
   const { studentId } = await params
+  const sp = await searchParams
   const ctx = await requireAuth()
 
   // 校验当前家长与该子女存在关系（同时按 parentId + studentId 过滤，防止跨家庭信息泄露）
@@ -38,15 +49,29 @@ export default async function ChildDetailPage({
     )
   }
 
-  const child = await getChildDashboardData(studentId, relation)
+  const [child, siblings] = await Promise.all([
+    getChildDashboardData(studentId, relation),
+    getChildNameList(ctx.userId),
+  ])
   if (!child) {
     notFound()
   }
 
+  const initialTab = getSearchParam(sp, "tab")
+
   return (
     <div className="p-6 md:p-8 space-y-6">
       <ChildDetailHeader child={child} />
-      <ChildDetailPanel child={child} />
+      <ChildDetailPanel
+        child={child}
+        initialTab={initialTab}
+        siblingSwitcher={
+          <SiblingSwitcher
+            current={{ id: child.basicInfo.id, name: child.basicInfo.name }}
+            siblings={siblings}
+          />
+        }
+      />
     </div>
   )
 }