fix(teacher): 统一详情页返回路径与中英文文案 (P1-3+P2-1)

P1-3: empty-state 默认按钮 variant 改为 outline 并新增 variant prop；button.tsx 导出 ButtonProps；统一 5 个详情页返回路径为 ghost+ArrowLeft+文字标签；course-plan-detail raw a 改为 Link。P2-1: formatLongDate 默认 locale 改为 zh-CN，weekday 改为 short；返回按钮文案中文化；course-plan-detail 全量中文化；grades/analytics 标题中文化。验证：tsc 0 错误，lint 0 错误，架构图 004/005 已同步。

docs/architecture/004_architecture_impact_map.md

@@ -461,7 +461,7 @@ src/auth.ts ──▶ import { ... } from "@/shared/lib/permissions"
 | 函数 | 文件 | 签名 | 用途 | 消费方 |
 |------|------|------|------|--------|
 | `formatDateTime` | `lib/utils.ts` | `formatDateTime(date, locale?): string` | 国际化日期+时间格式化（含小时、分钟） | 4 个（P1-3: lesson-plan-card, version-history-drawer, proctoring-dashboard, exam-ai-generator） |
-| `formatLongDate` | `lib/utils.ts` | `formatLongDate(date, locale?): string` | 国际化长日期格式化（含星期、完整月份名） | 1 个（P1-3: teacher-dashboard-header） |
+| `formatLongDate` | `lib/utils.ts` | `formatLongDate(date, locale?): string` | 国际化长日期格式化（含星期、完整月份名），默认 zh-CN，weekday=short | 1 个（P1-3: teacher-dashboard-header） |
 
 > 注：`SettingsView` 位于 `modules/settings/components/`（非 shared 层），因仅被 settings 模块消费，未下沉到 shared。此处列出以完整反映本次重构的组件抽取范围。
 
@@ -476,6 +476,8 @@ src/auth.ts ──▶ import { ... } from "@/shared/lib/permissions"
 - ✅ P2-2 已修复：~~`ai.ts` 218 行混合 5 类职责~~ 已拆分为 `ai/` 目录（payload-parser.ts/api-key-crypto.ts/provider-config.ts/client.ts/errors.ts/index.ts），原 `ai.ts` 保留为向后兼容的重导出文件（9 行）
 - ✅ P2-4 已修复：~~`onboarding-gate.tsx` 业务逻辑泄漏到 shared~~ 已迁移至 `modules/onboarding/`（actions/data-access/schema/types/components），引导流程改为独立路由 `/onboarding` + middleware 重定向 + Server Action
 - ✅ P0-2/P0-3/P0-4/P0-5/P1-1/P1-2/P1-4/P1-5 已修复（v3 对标 PowerSchool/Veracross/Auth0）：家长绑定三因子验证（邮箱+生日+手机号后4位）、教师多科目循环绑定、审计日志、服务端幂等、URL query 持久化步骤、局部错误收集、家长多子女动态行、跳过机制明确化
+- ✅ v3 i18n 体系引入：采用 next-intl 4.x（without i18n routing 模式），cookie 驱动 locale 切换，字典放在 `shared/i18n/messages/{locale}/`，支持 zh-CN/en 两种语言，不破坏现有路由组结构
+- ✅ v3 班级邀请码体系引入（对标 Google Classroom / 钉钉教育 / 智学网）：新增 `class_invitation_codes` 表（独立表，支持有效期/次数限制/审计/多码并存），6 位字母数字（剔除歧义字符 0/O/1/I/L，空间 1.13 亿），rate limit 防爆破（10 次/5 分钟），审计日志全链路记录，懒清理过期码
 
 **文件清单**：
 | 文件 | 行数 | 职责 |

src/app/(dashboard)/teacher/grades/analytics/page.tsx

@@ -46,14 +46,14 @@ export default async function GradeAnalyticsPage({
     return (
       <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Grade Analytics</h1>
+          <h1 className="text-2xl font-bold tracking-tight">成绩分析</h1>
           <p className="text-muted-foreground">
-            Trend analysis, class comparisons, and score distributions.
+            趋势分析、班级对比与分数分布。
           </p>
         </div>
         <EmptyState
-          title="No classes"
+          title="暂无班级"
-          description="You don't have any classes yet."
+          description="您还没有任何班级。"
           icon={BarChart3}
           className="border-none shadow-none"
         />
@@ -98,15 +98,15 @@ export default async function GradeAnalyticsPage({
     <div className="h-full flex-1 flex-col space-y-6 p-8 md:flex">
       <div className="flex flex-col justify-between gap-4 md:flex-row md:items-center">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Grade Analytics</h1>
+          <h1 className="text-2xl font-bold tracking-tight">成绩分析</h1>
           <p className="text-muted-foreground">
-            Trend analysis, class comparisons, and score distributions.
+            趋势分析、班级对比与分数分布。
           </p>
         </div>
-        <Button asChild variant="outline">
+        <Button asChild variant="ghost" size="sm">
           <Link href="/teacher/grades">
             <ArrowLeft className="mr-2 h-4 w-4" aria-hidden="true" />
-            Back to Grades
+            返回成绩列表
           </Link>
         </Button>
       </div>

src/app/(dashboard)/teacher/homework/assignments/[id]/page.tsx

@@ -7,7 +7,7 @@ import { HomeworkAssignmentQuestionErrorOverviewCard } from "@/modules/homework/
 import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
 import { formatDate } from "@/shared/lib/utils"
-import { ChevronLeft, Users, Calendar, BarChart3, CheckCircle2 } from "lucide-react"
+import { ArrowLeft, Users, Calendar, BarChart3, CheckCircle2 } from "lucide-react"
 
 export const dynamic = "force-dynamic"
 
@@ -25,14 +25,12 @@ export default async function HomeworkAssignmentDetailPage({ params }: { params:
       <div className="border-b bg-background px-8 py-5">
         <div className="flex flex-col gap-4 md:flex-row md:items-start md:justify-between">
           <div className="min-w-0 flex flex-col gap-2">
-            <div className="flex items-center gap-2 text-sm text-muted-foreground mb-1">
+            <Button asChild variant="ghost" size="sm" className="w-fit">
-              <Link href="/teacher/homework/assignments" className="flex items-center hover:text-foreground transition-colors">
+              <Link href="/teacher/homework/assignments">
-                <ChevronLeft className="h-4 w-4 mr-1" aria-hidden="true" />
+                <ArrowLeft className="mr-2 h-4 w-4" aria-hidden="true" />
-                Assignments
+                返回作业列表
               </Link>
-              <span aria-hidden="true">/</span>
+            </Button>
-              <span>Details</span>
-            </div>
             <div className="flex items-center gap-3">
               <h1 className="text-2xl font-bold tracking-tight text-foreground line-clamp-2">{assignment.title}</h1>
               <Badge variant={assignment.status === "published" ? "default" : "secondary"} className="capitalize">

src/app/(dashboard)/teacher/lesson-plans/new/page.tsx

@@ -10,12 +10,13 @@ export default function NewLessonPlanPage(): JSX.Element {
   return (
     <div className="p-6">
       <div className="mb-6 flex items-center gap-4">
-        <Button asChild variant="ghost" size="icon">
+        <Button asChild variant="ghost" size="sm">
-          <Link href="/teacher/lesson-plans" aria-label="Back to lesson plans">
+          <Link href="/teacher/lesson-plans">
-            <ArrowLeft className="h-4 w-4" aria-hidden="true" />
+            <ArrowLeft className="mr-2 h-4 w-4" aria-hidden="true" />
+            返回备课列表
           </Link>
         </Button>
-        <h1 className="text-2xl font-bold tracking-tight">New Lesson Plan</h1>
+        <h1 className="text-2xl font-bold tracking-tight">新建课案</h1>
       </div>
       <TemplatePicker />
     </div>

src/app/(dashboard)/teacher/textbooks/[id]/page.tsx

@@ -31,9 +31,10 @@ export default async function TextbookDetailPage({
     <div className="flex flex-col h-[calc(100vh-4rem)] overflow-hidden">
       {/* Header / Nav (Fixed height) */}
       <div className="flex items-center gap-4 py-4 border-b shrink-0 bg-background z-10">
-        <Button variant="ghost" size="icon" asChild>
+        <Button asChild variant="ghost" size="sm">
-          <Link href="/teacher/textbooks" aria-label="Back to textbooks">
+          <Link href="/teacher/textbooks">
-            <ArrowLeft className="h-4 w-4" aria-hidden="true" />
+            <ArrowLeft className="mr-2 h-4 w-4" aria-hidden="true" />
+            返回教材列表
           </Link>
         </Button>
         <div className="flex-1 min-w-0">

src/modules/course-plans/components/course-plan-detail.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from "react"
 import { useRouter } from "next/navigation"
+import Link from "next/link"
 import { toast } from "sonner"
 import { ArrowLeft, Pencil, Plus, Trash2 } from "lucide-react"
 
@@ -16,16 +17,7 @@ import {
   TableHeader,
   TableRow,
 } from "@/shared/components/ui/table"
-import {
+import { ConfirmDeleteDialog } from "@/shared/components/ui/confirm-delete-dialog"
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from "@/shared/components/ui/alert-dialog"
 import { usePermission } from "@/shared/hooks/use-permission"
 import { Permissions } from "@/shared/types/permissions"
 import { formatDate } from "@/shared/lib/utils"
@@ -36,10 +28,10 @@ import { deleteCoursePlanAction } from "../actions"
 import type { CoursePlanWithItems, CoursePlanStatus } from "../types"
 
 const STATUS_LABEL: Record<CoursePlanStatus, string> = {
-  planning: "Planning",
+  planning: "规划中",
-  active: "Active",
+  active: "进行中",
-  completed: "Completed",
+  completed: "已完成",
-  paused: "Paused",
+  paused: "已暂停",
 }
 
 export function CoursePlanDetail({
@@ -72,10 +64,10 @@ export function CoursePlanDetail({
         router.push(base)
         router.refresh()
       } else {
-        toast.error(res.message || "Failed to delete")
+        toast.error(res.message || "删除失败")
       }
     } catch {
-      toast.error("Failed to delete")
+      toast.error("删除失败")
     } finally {
       setIsWorking(false)
       setDeleteOpen(false)
@@ -94,51 +86,52 @@ export function CoursePlanDetail({
 
   return (
     <div className="space-y-6">
-      <div className="flex items-center justify-between gap-2">
+      <div className="flex flex-col gap-3">
-        <div className="flex items-center gap-2">
+        {backHref ? (
-          {backHref ? (
+          <Button asChild variant="ghost" size="sm" className="w-fit">
-            <Button asChild variant="ghost" size="icon">
+            <Link href={backHref}>
-              <a href={backHref}>
+              <ArrowLeft className="mr-2 h-4 w-4" aria-hidden="true" />
-                <ArrowLeft className="h-4 w-4" />
+              返回课程计划列表
-              </a>
+            </Link>
-            </Button>
+          </Button>
-          ) : null}
-          <h2 className="text-2xl font-bold tracking-tight">Course Plan</h2>
-        </div>
-        {canManage ? (
-          <div className="flex flex-wrap items-center gap-2">
-            {editHref ? (
-              <Button asChild variant="outline">
-                <a href={editHref}>
-                  <Pencil className="mr-2 h-4 w-4" />
-                  Edit
-                </a>
-              </Button>
-            ) : null}
-            <Button onClick={() => setDeleteOpen(true)} disabled={isWorking} variant="destructive">
-              <Trash2 className="mr-2 h-4 w-4" />
-              Delete
-            </Button>
-          </div>
         ) : null}
+        <div className="flex items-center justify-between gap-2">
+          <h2 className="text-2xl font-bold tracking-tight">课程计划</h2>
+          {canManage ? (
+            <div className="flex flex-wrap items-center gap-2">
+              {editHref ? (
+                <Button asChild variant="outline">
+                  <Link href={editHref}>
+                    <Pencil className="mr-2 h-4 w-4" />
+                    编辑
+                  </Link>
+                </Button>
+              ) : null}
+              <Button onClick={() => setDeleteOpen(true)} disabled={isWorking} variant="destructive">
+                <Trash2 className="mr-2 h-4 w-4" />
+                删除
+              </Button>
+            </div>
+          ) : null}
+        </div>
       </div>
 
       <Card>
         <CardHeader className="space-y-2">
           <div className="flex flex-wrap items-center gap-2">
-            <Badge variant="outline">{plan.className ?? "No class"}</Badge>
+            <Badge variant="outline">{plan.className ?? "无班级"}</Badge>
-            <Badge variant="outline">{plan.subjectName ?? "Unknown subject"}</Badge>
+            <Badge variant="outline">{plan.subjectName ?? "未知学科"}</Badge>
             <Badge>{STATUS_LABEL[plan.status]}</Badge>
-            <Badge variant="outline">Semester {plan.semester}</Badge>
+            <Badge variant="outline">第 {plan.semester} 学期</Badge>
           </div>
           <CardTitle className="text-xl">
-            {plan.subjectName ?? "Course Plan"} — {plan.className ?? "No Class"}
+            {plan.subjectName ?? "课程计划"} — {plan.className ?? "无班级"}
           </CardTitle>
           <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
-            <span>Teacher: {plan.teacherName ?? "Unassigned"}</span>
+            <span>教师：{plan.teacherName ?? "未分配"}</span>
-            <span>· Created {formatDate(plan.createdAt)}</span>
+            <span>· 创建于 {formatDate(plan.createdAt)}</span>
-            {plan.startDate ? <span>· Start {formatDate(plan.startDate)}</span> : null}
+            {plan.startDate ? <span>· 开始 {formatDate(plan.startDate)}</span> : null}
-            {plan.endDate ? <span>· End {formatDate(plan.endDate)}</span> : null}
+            {plan.endDate ? <span>· 结束 {formatDate(plan.endDate)}</span> : null}
           </div>
         </CardHeader>
         <CardContent className="space-y-4">
@@ -150,13 +143,13 @@ export function CoursePlanDetail({
           />
           {plan.syllabus ? (
             <div className="space-y-1">
-              <h4 className="text-sm font-semibold">Syllabus</h4>
+              <h4 className="text-sm font-semibold">教学大纲</h4>
               <p className="whitespace-pre-wrap text-sm text-muted-foreground">{plan.syllabus}</p>
             </div>
           ) : null}
           {plan.objectives ? (
             <div className="space-y-1">
-              <h4 className="text-sm font-semibold">Objectives</h4>
+              <h4 className="text-sm font-semibold">教学目标</h4>
               <p className="whitespace-pre-wrap text-sm text-muted-foreground">{plan.objectives}</p>
             </div>
           ) : null}
@@ -165,28 +158,28 @@ export function CoursePlanDetail({
 
       <Card>
         <CardHeader className="flex flex-row items-center justify-between space-y-0">
-          <CardTitle>Weekly Plan</CardTitle>
+          <CardTitle>周计划</CardTitle>
           {canManage ? (
             <Button onClick={openCreateEditor} size="sm">
               <Plus className="mr-2 h-4 w-4" />
-              Add Week
+              添加周计划
             </Button>
           ) : null}
         </CardHeader>
         <CardContent>
           {plan.items.length === 0 ? (
             <p className="py-6 text-center text-sm text-muted-foreground">
-              No weekly plans yet. {canManage ? "Click \"Add Week\" to create one." : ""}
+              暂无周计划。{canManage ? "点击「添加周计划」创建第一条。" : ""}
             </p>
           ) : (
             <Table>
               <TableHeader>
                 <TableRow>
-                  <TableHead className="w-16">Week</TableHead>
+                  <TableHead className="w-16">周次</TableHead>
-                  <TableHead>Topic</TableHead>
+                  <TableHead>主题</TableHead>
-                  <TableHead className="w-20">Hours</TableHead>
+                  <TableHead className="w-20">课时</TableHead>
-                  <TableHead className="w-32">Chapter</TableHead>
+                  <TableHead className="w-32">章节</TableHead>
-                  <TableHead className="w-28">Status</TableHead>
+                  <TableHead className="w-28">状态</TableHead>
                 </TableRow>
               </TableHeader>
               <TableBody>
@@ -207,7 +200,7 @@ export function CoursePlanDetail({
                         ) : null}
                         {item.notes ? (
                           <p className="text-xs text-muted-foreground italic">
-                            Note: {item.notes}
+                            备注：{item.notes}
                           </p>
                         ) : null}
                       </div>
@@ -218,7 +211,7 @@ export function CoursePlanDetail({
                     </TableCell>
                     <TableCell>
                       <Badge variant={item.isCompleted ? "default" : "secondary"}>
-                        {item.isCompleted ? "Done" : "Pending"}
+                        {item.isCompleted ? "已完成" : "待完成"}
                       </Badge>
                     </TableCell>
                   </TableRow>
@@ -237,22 +230,14 @@ export function CoursePlanDetail({
         onOpenChange={setEditorOpen}
       />
 
-      <AlertDialog open={deleteOpen} onOpenChange={setDeleteOpen}>
+      <ConfirmDeleteDialog
-        <AlertDialogContent>
+        open={deleteOpen}
-          <AlertDialogHeader>
+        onOpenChange={setDeleteOpen}
-            <AlertDialogTitle>Delete course plan</AlertDialogTitle>
+        title="删除课程计划"
-            <AlertDialogDescription>
+        description="此操作将永久删除该课程计划及其所有周计划。"
-              This will permanently delete this course plan and all its weekly plans.
+        onConfirm={handleDelete}
-            </AlertDialogDescription>
+        isWorking={isWorking}
-          </AlertDialogHeader>
+      />
-          <AlertDialogFooter>
-            <AlertDialogCancel disabled={isWorking}>Cancel</AlertDialogCancel>
-            <AlertDialogAction onClick={handleDelete} disabled={isWorking}>
-              Delete
-            </AlertDialogAction>
-          </AlertDialogFooter>
-        </AlertDialogContent>
-      </AlertDialog>
     </div>
   )
 }

src/shared/components/ui/button.tsx

@@ -34,16 +34,18 @@ const buttonVariants = cva(
   }
 )
 
+type ButtonProps = React.ComponentProps<"button"> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean
+  }
+
 function Button({
   className,
   variant,
   size,
   asChild = false,
   ...props
-}: React.ComponentProps<"button"> &
+}: ButtonProps) {
-  VariantProps<typeof buttonVariants> & {
-    asChild?: boolean
-  }) {
   const Comp = asChild ? Slot : "button"
 
   return (
@@ -55,4 +57,4 @@ function Button({
   )
 }
 
-export { Button, buttonVariants }
+export { Button, buttonVariants, type ButtonProps }

src/shared/components/ui/empty-state.tsx

@@ -2,6 +2,7 @@ import * as React from "react"
 import Link from "next/link"
 import { cn } from "@/shared/lib/utils"
 import { Button } from "@/shared/components/ui/button"
+import type { ButtonProps } from "@/shared/components/ui/button"
 
 interface EmptyStateProps extends React.HTMLAttributes<HTMLDivElement> {
   title: string
@@ -11,6 +12,8 @@ interface EmptyStateProps extends React.HTMLAttributes<HTMLDivElement> {
     label: string
     onClick?: () => void
     href?: string
+    /** 按钮样式，默认 "outline"（次级按钮）。首次引导场景可用 "default"（主按钮） */
+    variant?: ButtonProps["variant"]
   }
 }
 
@@ -44,11 +47,11 @@ export function EmptyState({
         )}
         {action && (
             action.href ? (
-              <Button asChild variant="default">
+              <Button asChild variant={action.variant ?? "outline"}>
                 <Link href={action.href}>{action.label}</Link>
               </Button>
             ) : (
-              <Button onClick={action.onClick} variant="default">
+              <Button onClick={action.onClick} variant={action.variant ?? "outline"}>
                 {action.label}
               </Button>
             )

src/shared/lib/utils.ts

@@ -13,6 +13,34 @@ export function formatDate(date: string | Date, locale: string = "zh-CN") {
   }).format(new Date(date))
 }
 
+/**
+ * 格式化日期+时间（含小时、分钟）。
+ * 用于替代各处重复的 `new Date(x).toLocaleString("zh-CN", {...})` 调用。
+ */
+export function formatDateTime(date: string | Date, locale: string = "zh-CN") {
+  return new Intl.DateTimeFormat(locale, {
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+    hour: "2-digit",
+    minute: "2-digit",
+  }).format(new Date(date))
+}
+
+/**
+ * 格式化为长日期（含星期、完整月份名）。
+ * 用于替代 `new Date(x).toLocaleDateString("en-US", { weekday: "long", year: "numeric", month: "long", day: "numeric" })`。
+ * 默认使用中文 locale，输出形如「2026年6月20日 周一」。
+ */
+export function formatLongDate(date: string | Date, locale: string = "zh-CN") {
+  return new Intl.DateTimeFormat(locale, {
+    weekday: "short",
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  }).format(new Date(date))
+}
+
 /** Next.js App Router 搜索参数类型 */
 export type SearchParams = { [key: string]: string | string[] | undefined }