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)/student/learning/textbooks/[id]/page.tsx

@@ -3,8 +3,9 @@ import { getTranslations } from "next-intl/server"
 
 import { BookOpen } from "lucide-react"
 
-import { getTextbookById, getChaptersByTextbookId, getKnowledgePointsByTextbookId } from "@/modules/textbooks/data-access"
+import { getTextbookById, getChaptersByTextbookId } from "@/modules/textbooks/data-access"
 import { TextbookReader } from "@/modules/textbooks/components/textbook-reader"
+import { getSubjectLabelKey, getGradeLabelKey } from "@/modules/textbooks/constants"
 import { Badge } from "@/shared/components/ui/badge"
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { getCurrentStudentUser } from "@/modules/users/data-access"
@@ -23,10 +24,9 @@ export default async function StudentTextbookDetailPage({
 
   const { id } = await params
 
-  const [textbook, chapters, knowledgePoints] = await Promise.all([
+  const [textbook, chapters] = await Promise.all([
     getTextbookById(id),
     getChaptersByTextbookId(id),
-    getKnowledgePointsByTextbookId(id)
   ])
 
   if (!textbook) notFound()
@@ -45,9 +45,9 @@ export default async function StudentTextbookDetailPage({
           <h1 className="text-lg font-bold tracking-tight truncate">{textbook.title}</h1>
           <div className="flex items-center gap-2 text-sm text-muted-foreground">
              <span className="hidden sm:inline-block w-px h-4 bg-border" aria-hidden="true" />
-             <Badge variant="outline" className="font-normal text-xs">{textbook.subject}</Badge>
+             <Badge variant="outline" className="font-normal text-xs">{t(`subject.${getSubjectLabelKey(textbook.subject)}`)}</Badge>
              {textbook.grade && (
-               <Badge variant="secondary" className="font-normal text-xs">{textbook.grade}</Badge>
+               <Badge variant="secondary" className="font-normal text-xs">{t(`grade.${getGradeLabelKey(textbook.grade)}`)}</Badge>
              )}
           </div>
         </div>
@@ -66,7 +66,7 @@ export default async function StudentTextbookDetailPage({
         ) : (
           <div className="h-full min-h-0 max-w-[1600px] mx-auto w-full">
             {/* 学生端不传 renderQuestionCreator，无题目创建权限 */}
-            <TextbookReader chapters={chapters} knowledgePoints={knowledgePoints} />
+            <TextbookReader key={id} chapters={chapters} textbookId={id} />
           </div>
         )}
       </div>

src/app/(dashboard)/student/learning/textbooks/page.tsx

@@ -7,16 +7,10 @@ import { TextbookFilters } from "@/modules/textbooks/components/textbook-filters
 import { getCurrentStudentUser } from "@/modules/users/data-access"
 import { getGradeNameById } from "@/modules/school/data-access"
 import { EmptyState } from "@/shared/components/ui/empty-state"
+import { getParam, type SearchParams } from "@/shared/lib/search-params"
 
 export const dynamic = "force-dynamic"
 
-type SearchParams = { [key: string]: string | string[] | undefined }
-
-const getParam = (params: SearchParams, key: string): string | undefined => {
-  const v = params[key]
-  return Array.isArray(v) ? v[0] : v
-}
-
 export default async function StudentTextbooksPage({
   searchParams,
 }: {