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/classes/components/grade-classes-view.tsx

@@ -140,9 +140,9 @@ export function GradeClassesClient({
   const formatSubjectTeachers = (list: ClassSubjectTeacherAssignment[]) => {
     const pairs = list
       .filter((x) => x.teacher)
-      .map((x) => `${x.subject}:${x.teacher?.name ?? ""}`)
+      .map((x) => `${x.subject}: ${x.teacher?.name ?? ""}`)
       .filter((x) => x.length > 0)
-    return pairs.length > 0 ? pairs.join("，") : "-"
+    return pairs.length > 0 ? pairs.join(", ") : "-"
   }
 
   const selectedCreateGrade = managedGrades.find(g => g.id === createGradeId)
@@ -180,8 +180,8 @@ export function GradeClassesClient({
                   <TableHead>Grade</TableHead>
                   <TableHead>Homeroom</TableHead>
                   <TableHead>Room</TableHead>
-                  <TableHead>班主任</TableHead>
-                  <TableHead>任课老师</TableHead>
+                  <TableHead>Homeroom Teacher</TableHead>
+                  <TableHead>Subject Teachers</TableHead>
                   <TableHead className="text-right">Students</TableHead>
                   <TableHead>Updated</TableHead>
                   <TableHead className="w-[60px]" />
@@ -280,7 +280,7 @@ export function GradeClassesClient({
             </div>
 
             <div className="grid grid-cols-4 items-center gap-4">
-              <Label className="text-right">班主任</Label>
+              <Label className="text-right">Homeroom Teacher</Label>
               <div className="col-span-3">
                 <Select value={createTeacherId} onValueChange={setCreateTeacherId} disabled={teachers.length === 0}>
                   <SelectTrigger>
@@ -367,9 +367,9 @@ export function GradeClassesClient({
               </div>
 
               <div className="grid grid-cols-4 items-center gap-4">
-                <Label className="text-right">班主任</Label>
-                <div className="col-span-3">
-                  <Select value={editTeacherId} onValueChange={setEditTeacherId} disabled={teachers.length === 0}>
+              <Label className="text-right">Homeroom Teacher</Label>
+              <div className="col-span-3">
+                <Select value={editTeacherId} onValueChange={setEditTeacherId} disabled={teachers.length === 0}>
                     <SelectTrigger>
                       <SelectValue placeholder={teachers.length === 0 ? "No teachers" : "Select a teacher"} />
                     </SelectTrigger>
@@ -386,7 +386,7 @@ export function GradeClassesClient({
               </div>
 
               <div className="space-y-3 rounded-md border p-4">
-                <div className="text-sm font-medium">任课老师</div>
+                <div className="text-sm font-medium">Subject Teachers</div>
                 <div className="grid gap-3">
                   {DEFAULT_CLASS_SUBJECTS.map((subject) => {
                     const selected = editSubjectTeachers.find((x) => x.subject === subject)?.teacherId ?? null