feat(dashboard): 仪表盘模块审计重构 — 权限校验 + i18n + 逻辑抽离

基于 dashboard-audit-report.md 审计结论，对仪表盘模块进行 P0/P1 级修复：

- 新增 4 个 dashboard 权限点（DASHBOARD_ADMIN/TEACHER/STUDENT/PARENT_READ），补充到 permissions.ts 和角色-权限映射

- 新建 actions.ts：4 个 Server Action 均调用 requirePermission() 校验权限，消除 admin 页面零鉴权、teacher/student/parent 仅 requireAuth 的安全隐患

- 根重定向页 /dashboard 改用 resolvePermissions() + 权限点判断，不再 role === xxx 硬编码

- 新建 lib/dashboard-utils.ts：抽取 toWeekday / countStudentAssignments / sortUpcomingAssignments / filterTodaySchedule / computeTeacherMetrics / getGreetingKey 纯函数，与 UI 分离，便于单测

- 新建 messages/{zh-CN,en}/dashboard.json 翻译文件，i18n request.ts 加载 dashboard 命名空间；所有视图组件接入 useTranslations / getTranslations，消除中英混杂硬编码

- 重构 4 个角色 page.tsx：通过 actions 获取数据，generateMetadata 使用 i18n

- 同步更新架构图 004 / 005 文档（dashboard exports / permissions / 文件清单）

src/modules/parent/components/parent-dashboard.tsx

@@ -1,74 +1,106 @@
 import Link from "next/link"
-import { CalendarCheck, CalendarDays, GraduationCap, Users } from "lucide-react"
+import { getTranslations } from "next-intl/server"
+import {
+  CalendarCheck,
+  CalendarDays,
+  GraduationCap,
+  Megaphone,
+  Users,
+} from "lucide-react"
 
-import { Button } from "@/shared/components/ui/button"
+import { Card, CardContent } from "@/shared/components/ui/card"
 import { EmptyState } from "@/shared/components/ui/empty-state"
-import { ChildCard } from "./child-card"
 import type { ParentDashboardData } from "@/modules/parent/types"
+import { getGreetingKey } from "@/modules/dashboard/lib/dashboard-utils"
+import { ChildCard } from "./child-card"
+import { ParentAttentionBanner } from "./parent-attention-banner"
 
-export function ParentDashboard({ data }: { data: ParentDashboardData }) {
+export async function ParentDashboard({ data }: { data: ParentDashboardData }) {
+  const t = await getTranslations("dashboard")
   const { parentName, children } = data
   const hasChildren = children.length > 0
 
-  const hour = new Date().getHours()
-  let greeting = "Welcome"
-  if (hour < 12) greeting = "Good morning"
-  else if (hour < 18) greeting = "Good afternoon"
-  else greeting = "Good evening"
+  const greetingKey = getGreetingKey(new Date())
+
+  const QUICK_ENTRIES = [
+    { href: "/parent/grades", label: t("quickActions.grades"), icon: GraduationCap },
+    { href: "/parent/attendance", label: t("quickActions.attendance"), icon: CalendarCheck },
+    { href: "/announcements", label: t("quickActions.announcements"), icon: Megaphone },
+    { href: "/parent/leave", label: t("quickActions.leaveRequest"), icon: CalendarDays },
+  ] as const
 
   return (
     <div className="space-y-6">
-      <div className="flex flex-col justify-between gap-4 md:flex-row md:items-center">
-        <div className="space-y-1">
-          <h1 className="text-2xl font-bold tracking-tight">Parent Dashboard</h1>
-          <div className="text-sm text-muted-foreground">
-            {greeting}
-            {parentName ? `, ${parentName}` : ""}. Here&apos;s an overview of your children.
-          </div>
-        </div>
-        <div className="flex flex-wrap items-center gap-2">
-          <Button asChild variant="outline" size="sm" className="gap-2">
-            <Link href="/parent/grades">
-              <GraduationCap className="h-4 w-4" />
-              Grades
-            </Link>
-          </Button>
-          <Button asChild variant="outline" size="sm" className="gap-2">
-            <Link href="/parent/attendance">
-              <CalendarCheck className="h-4 w-4" />
-              Attendance
-            </Link>
-          </Button>
-          <Button asChild variant="outline" size="sm" className="gap-2">
-            <Link href="/announcements">
-              <CalendarDays className="h-4 w-4" />
-              Announcements
-            </Link>
-          </Button>
+      <div className="space-y-1">
+        <h1 className="text-2xl font-bold tracking-tight">{t("title.parent")}</h1>
+        <div className="text-sm text-muted-foreground">
+          {t(`greeting.${greetingKey}`)}
+          {parentName ? `, ${parentName}` : ""}. {t("description.parent")}
         </div>
       </div>
 
-      {!hasChildren ? (
-        <EmptyState
-          icon={Users}
-          title="No children linked"
-          description="Your account is not linked to any student accounts yet. Please contact the school administrator."
-          className="border-none shadow-none"
-        />
-      ) : (
+      {hasChildren ? (
         <>
+          <ParentAttentionBanner data={data} />
+
+          <nav
+            aria-label={t("quickActions.announcements")}
+            className="grid grid-cols-2 gap-3 sm:grid-cols-4"
+          >
+            {QUICK_ENTRIES.map((entry) => (
+              <Link
+                key={entry.href}
+                href={entry.href}
+                className="group"
+                aria-label={entry.label}
+              >
+                <Card className="h-full transition-colors hover:bg-muted/50 focus-within:ring-2 focus-within:ring-ring focus-within:ring-offset-2">
+                  <CardContent className="flex flex-col items-center justify-center gap-2 p-4 text-center">
+                    <entry.icon
+                      className="h-6 w-6 text-muted-foreground group-hover:text-foreground"
+                      aria-hidden
+                    />
+                    <span className="text-sm font-medium">{entry.label}</span>
+                  </CardContent>
+                </Card>
+              </Link>
+            ))}
+          </nav>
+
           <div className="flex items-center gap-2 text-sm text-muted-foreground">
-            <Users className="h-4 w-4" />
+            <Users className="h-4 w-4" aria-hidden />
             <span>
-              {children.length} {children.length === 1 ? "child" : "children"} linked
+              {t("badge.childrenLinked", { count: children.length })}
             </span>
           </div>
-          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
+          {/* 移动端水平滑动卡片，桌面端网格布局 */}
+          <div
+            className="flex gap-4 overflow-x-auto pb-2 snap-x snap-mandatory sm:hidden"
+            aria-label={t("title.parent")}
+          >
+            {children.map((child) => (
+              <div key={child.basicInfo.id} className="snap-start shrink-0 w-[85%]">
+                <ChildCard child={child} />
+              </div>
+            ))}
+          </div>
+          <div className="hidden sm:grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
             {children.map((child) => (
               <ChildCard key={child.basicInfo.id} child={child} />
             ))}
           </div>
         </>
+      ) : (
+        <EmptyState
+          icon={Users}
+          title={t("empty.noChildren")}
+          description={t("empty.noChildrenDesc")}
+          className="border-none shadow-none"
+          action={{
+            label: t("empty.contactSupport"),
+            href: "/messages",
+          }}
+        />
       )}
     </div>
   )