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/diagnostic/page.tsx

@@ -1,5 +1,6 @@
 import { Stethoscope } from "lucide-react"
-import { getAuthContext } from "@/shared/lib/auth-guard"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 import { getStudentMasterySummary } from "@/modules/diagnostic/data-access"
 import { getDiagnosticReports } from "@/modules/diagnostic/data-access-reports"
 import { StudentDiagnosticView } from "@/modules/diagnostic/components/student-diagnostic-view"
@@ -7,15 +8,20 @@ import { StudentDiagnosticView } from "@/modules/diagnostic/components/student-d
 export const dynamic = "force-dynamic"
 
 export default async function StudentDiagnosticPage() {
-  const ctx = await getAuthContext()
+  const ctx = await requirePermission(Permissions.DIAGNOSTIC_READ)
 
-  const [summary, reports] = await Promise.all([
+  const [summary, reportsResult] = await Promise.all([
     getStudentMasterySummary(ctx.userId),
-    getDiagnosticReports({ studentId: ctx.userId }),
+    // v4-P1-3: 学生仅可见已发布报告，避免草稿泄露
+    getDiagnosticReports(
+      { studentId: ctx.userId, status: "published" },
+      ctx.dataScope,
+    ),
   ])
+  const reports = reportsResult.reports
 
   return (
-    <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
+    <div className="space-y-8">
       <div>
         <h2 className="flex items-center gap-2 text-2xl font-bold tracking-tight">
           <Stethoscope className="h-6 w-6" />