feat: 新增备课模块并修复全模块 P0/P1/P2 缺陷

主要变更:

- 新增 lesson-preparation 模块: 备课编辑器、节点编辑、AI 建议、知识点选择、版本历史、作业发布

- 新增 shared 通用组件: charts/question-bank-filters/schedule-list/ui (chip-nav/filter-bar/page-header/stat-card/stat-item)

- 新增 student/admin 端 loading.tsx 与 error.tsx, 优化加载与错误态体验

- 新增 teacher/lesson-plans 页面 (列表/新建/编辑)

- 新增 drizzle 迁移 0002_tiny_lionheart 及 snapshot

- 新增 textbooks/schema.ts 与 exams/utils/normalize-structure.ts

- 修复 Tiptap v3 SSR hydration 崩溃 (rich-text-block immediatelyRender: false)

- 重构多模块 data-access/actions/组件, 修复权限校验与类型规范

- 同步架构文档 004/005 反映新增模块、导出、依赖关系

- 归档 bugs/* 测试报告与 e2e 测试脚本 (admin/parent/student/teacher web_test)

src/modules/settings/components/settings-view.tsx

@@ -0,0 +1,117 @@
+"use client"
+
+import Link from "next/link"
+import type { ReactNode } from "react"
+import { User, Palette, Lock, Bell } from "lucide-react"
+import { signOut } from "next-auth/react"
+
+import { ThemePreferencesCard } from "@/modules/settings/components/theme-preferences-card"
+import { ProfileSettingsForm } from "@/modules/settings/components/profile-settings-form"
+import { PasswordChangeForm } from "@/modules/settings/components/password-change-form"
+import { NotificationPreferencesForm } from "@/modules/settings/components/notification-preferences-form"
+import { Button } from "@/shared/components/ui/button"
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/shared/components/ui/card"
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/shared/components/ui/tabs"
+import { UserProfile } from "@/modules/users/data-access"
+import type { NotificationPreferences } from "@/modules/notifications/types"
+
+interface SettingsViewProps {
+  /** 页面副标题描述 */
+  description: string
+  /** 返回仪表盘的链接 */
+  backHref: string
+  /** 当前用户 */
+  user: UserProfile
+  /** 通知偏好 */
+  notificationPreferences: NotificationPreferences
+  /** General 标签页中 ProfileSettingsForm 下方的内容（角色专属快捷链接/组织信息等） */
+  generalExtra?: ReactNode
+}
+
+/**
+ * 统一设置页视图
+ *
+ * 消除 admin / teacher / student 三个设置视图的重复布局：
+ * - 相同的页面头部（标题 + 描述 + 返回按钮）
+ * - 相同的 4 个标签页（General / Notifications / Appearance / Security）
+ * - 相同的 Notifications / Appearance / Security 标签页内容
+ * - 相同的 Session 卡片（登出）
+ *
+ * 角色差异通过 `description`、`backHref` 和 `generalExtra` 三个 props 注入。
+ */
+export function SettingsView({
+  description,
+  backHref,
+  user,
+  notificationPreferences,
+  generalExtra,
+}: SettingsViewProps) {
+  return (
+    <div className="flex h-full flex-col gap-8 p-8">
+      <div className="flex flex-col justify-between gap-4 md:flex-row md:items-center">
+        <div className="space-y-1">
+          <h1 className="text-3xl font-bold tracking-tight">Settings</h1>
+          <div className="text-sm text-muted-foreground">{description}</div>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button asChild variant="outline">
+            <Link href={backHref}>Back to dashboard</Link>
+          </Button>
+        </div>
+      </div>
+
+      <Tabs defaultValue="general" className="w-full">
+        <TabsList className="w-full justify-start">
+          <TabsTrigger value="general" className="gap-2">
+            <User className="h-4 w-4" />
+            General
+          </TabsTrigger>
+          <TabsTrigger value="notifications" className="gap-2">
+            <Bell className="h-4 w-4" />
+            Notifications
+          </TabsTrigger>
+          <TabsTrigger value="appearance" className="gap-2">
+            <Palette className="h-4 w-4" />
+            Appearance
+          </TabsTrigger>
+          <TabsTrigger value="security" className="gap-2">
+            <Lock className="h-4 w-4" />
+            Security
+          </TabsTrigger>
+        </TabsList>
+
+        <TabsContent value="general" className="mt-6 space-y-6">
+          <ProfileSettingsForm user={user} />
+          {generalExtra}
+        </TabsContent>
+
+        <TabsContent value="notifications" className="mt-6 space-y-6">
+          <NotificationPreferencesForm preferences={notificationPreferences} />
+        </TabsContent>
+
+        <TabsContent value="appearance" className="mt-6 space-y-6">
+          <ThemePreferencesCard />
+        </TabsContent>
+
+        <TabsContent value="security" className="mt-6 space-y-6">
+          <PasswordChangeForm />
+          <Card>
+            <CardHeader>
+              <CardTitle>Session</CardTitle>
+              <CardDescription>Account access and session controls.</CardDescription>
+            </CardHeader>
+            <CardContent className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
+              <div className="space-y-1">
+                <div className="text-sm font-medium">Sign out</div>
+                <div className="text-sm text-muted-foreground">Return to the login screen.</div>
+              </div>
+              <Button variant="outline" onClick={() => signOut({ callbackUrl: "/login" })}>
+                Log out
+              </Button>
+            </CardContent>
+          </Card>
+        </TabsContent>
+      </Tabs>
+    </div>
+  )
+}