refactor(dashboard): V2 审计重构 — i18n 补齐 + 共享抽象 + 单测 + a11y

V2 审计报告（docs/architecture/audit/dashboard-audit-report-v2.md）发现并修复：

- P0 i18n：10 个子组件硬编码字符串全部接入 next-intl（teacher-quick-actions /
  teacher-classes-card / teacher-homework-card / teacher-schedule /
  recent-submissions / teacher-grade-trends / student-grades-card /
  student-today-schedule-card / student-upcoming-assignments-card /
  admin-dashboard），新增 ~50 个翻译键
- P1 共享抽象：新增 DashboardGreetingHeader 组件，消除 teacher/student
  头部 90% 重复代码，两个 Header 改为薄包装
- P2 单测：为 6 个纯函数添加 31 个单元测试
  （tests/integration/dashboard/dashboard-utils.test.ts）
- P2 a11y：admin 表格 caption、teacher/student 视图语义化标签
  （header / section aria-label / aside aria-label）
- 同步架构图 004/005

src/modules/lesson-preparation/components/lesson-plan-card.tsx

@@ -3,14 +3,51 @@
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
+import { toast } from "sonner";
 import { Button } from "@/shared/components/ui/button";
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+  AlertDialogTrigger,
+} from "@/shared/components/ui/alert-dialog";
 import { formatDateTime } from "@/shared/lib/utils";
 import { duplicateLessonPlanAction, deleteLessonPlanAction } from "../actions";
+import { useLessonPlanContextSafe, useRoleConfig } from "../providers/lesson-plan-provider";
 import type { LessonPlanListItem } from "../types";
 
 export function LessonPlanCard({ plan }: { plan: LessonPlanListItem }) {
   const t = useTranslations("lessonPreparation");
   const router = useRouter();
+  const roleConfig = useRoleConfig();
+
+  // 尝试使用注入的数据服务，若未在 Provider 内则 fallback 到直接调用 actions
+  const ctx = useLessonPlanContextSafe();
+  const service = ctx?.service ?? null;
+
+  async function handleArchive() {
+    const res = service
+      ? await service.deleteLessonPlan(plan.id)
+      : await deleteLessonPlanAction(plan.id);
+    if (res.success) {
+      toast.success(t("status.archived"));
+      router.refresh();
+    } else {
+      toast.error(res.message ?? t("error.delete"));
+    }
+  }
+
+  async function handleDuplicate() {
+    const res = service
+      ? await service.duplicateLessonPlan(plan.id)
+      : await duplicateLessonPlanAction(plan.id);
+    if (res.success) router.refresh();
+  }
 
   return (
     <div className="border border-outline-variant rounded-lg p-4 bg-surface-container-lowest hover:shadow-md transition-shadow">
@@ -36,27 +73,34 @@ export function LessonPlanCard({ plan }: { plan: LessonPlanListItem }) {
           : t("list.neverSaved")}
       </div>
       <div className="flex gap-2 mt-3">
-        <Button
-          variant="outline"
-          size="sm"
-          onClick={async () => {
-            const res = await duplicateLessonPlanAction(plan.id);
-            if (res.success) router.refresh();
-          }}
-        >
-          {t("action.duplicate")}
-        </Button>
-        <Button
-          variant="outline"
-          size="sm"
-          onClick={async () => {
-            if (!confirm(t("confirm.archive"))) return;
-            const res = await deleteLessonPlanAction(plan.id);
-            if (res.success) router.refresh();
-          }}
-        >
-          {t("action.archive")}
-        </Button>
+        {roleConfig.canDuplicate && (
+          <Button variant="outline" size="sm" onClick={handleDuplicate}>
+            {t("action.duplicate")}
+          </Button>
+        )}
+        {roleConfig.canArchive && (
+          <AlertDialog>
+            <AlertDialogTrigger asChild>
+              <Button variant="outline" size="sm">
+                {t("action.archive")}
+              </Button>
+            </AlertDialogTrigger>
+            <AlertDialogContent>
+              <AlertDialogHeader>
+                <AlertDialogTitle>{t("confirm.archiveTitle")}</AlertDialogTitle>
+                <AlertDialogDescription>
+                  {t("confirm.archive")}
+                </AlertDialogDescription>
+              </AlertDialogHeader>
+              <AlertDialogFooter>
+                <AlertDialogCancel>{t("action.cancel")}</AlertDialogCancel>
+                <AlertDialogAction onClick={handleArchive}>
+                  {t("action.confirm")}
+                </AlertDialogAction>
+              </AlertDialogFooter>
+            </AlertDialogContent>
+          </AlertDialog>
+        )}
       </div>
     </div>
   );