feat(app): add lesson-plans, practice, and grade dashboard routes

- Add admin/lesson-plans, parent/lesson-plans, student/lesson-plans routes

- Add student/practice and teacher/practice routes for adaptive practice

- Add management/grade/dashboard and management/grade/practice routes

- Add teacher/lesson-plans error and loading boundaries

- Update existing admin, parent, student, teacher pages with new features

- Update globals.css and proxy middleware

src/app/(dashboard)/student/practice/[sessionId]/error.tsx

@@ -0,0 +1,32 @@
+"use client"
+
+import { useEffect } from "react"
+import Link from "next/link"
+import { useTranslations } from "next-intl"
+import { Button } from "@/shared/components/ui/button"
+
+export default function PracticeSessionError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}): React.ReactNode {
+  const t = useTranslations("student")
+  useEffect(() => {
+    console.error("Practice session error:", error)
+  }, [error])
+
+  return (
+    <div className="flex h-full flex-col items-center justify-center space-y-4 p-8">
+      <h2 className="text-xl font-semibold">{t("error.title")}</h2>
+      <p className="text-sm text-muted-foreground">{error.message}</p>
+      <div className="flex gap-2">
+        <Button onClick={reset}>{t("error.retry")}</Button>
+        <Button variant="outline" asChild>
+          <Link href="/student/practice">{t("classDetail.backToCourses")}</Link>
+        </Button>
+      </div>
+    </div>
+  )
+}