feat(app): add error/loading boundaries across all dashboard routes and new routes

- Add error.tsx and loading.tsx boundaries for admin, parent, student, teacher routes

- Add admin announcements edit, audit-logs overview, curriculum-map, invitation-codes, permissions, questions, roles routes

- Add admin elective detail and components, files, course-plans, users, scheduling boundaries

- Add messages group-compose route

- Add parent course-plans, elective, grades report-card, practice routes

- Add student course-plans, elective detail, error-book dialogs, grades report-card, learning study-path, leave, schedule boundaries

- Add teacher attendance report, classes boundaries, course-plans boundaries, elective, exams analytics/edit-rich/all/create/new, grades report-card, homework boundaries, leave, lesson-plans calendar

- Add auth loading, onboarding loading, api cron

src/app/(dashboard)/messages/compose/page.tsx

@@ -3,8 +3,10 @@ import type { JSX } from "react"
 import { getTranslations } from "next-intl/server"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
-import { getRecipients } from "@/modules/messaging/data-access"
+import { SectionErrorBoundary } from "@/shared/components/section-error-boundary"
+import { getRecipients, getMessageDrafts } from "@/modules/messaging/data-access"
 import { MessageCompose } from "@/modules/messaging/components/message-compose"
+import { MessageDraftList } from "@/modules/messaging/components/message-draft-list"
 
 export const dynamic = "force-dynamic"
 
@@ -25,7 +27,11 @@ export default async function ComposeMessagePage({
   const sp = await searchParams
   const t = await getTranslations("messages")
 
-  const recipients = await getRecipients(ctx.userId, ctx.dataScope)
+  const [recipients, drafts] = await Promise.all([
+    getRecipients(ctx.userId, ctx.dataScope),
+    // P1-1: 获取草稿列表用于展示与恢复编辑
+    getMessageDrafts(ctx.userId),
+  ])
 
   return (
     <div className="flex h-full flex-col p-8">
@@ -34,12 +40,20 @@ export default async function ComposeMessagePage({
           <h2 className="text-2xl font-bold tracking-tight">{t("title.compose")}</h2>
           <p className="text-muted-foreground">{t("description.compose")}</p>
         </div>
-        <MessageCompose
-          recipients={recipients}
-          parentMessageId={sp.parentId}
-          defaultReceiverId={sp.receiverId}
-          defaultSubject={sp.subject}
-        />
+        {/* P2-8: 撰写表单区块独立 ErrorBoundary，失败不影响草稿列表 */}
+        <SectionErrorBoundary namespace="messages">
+          <MessageCompose
+            recipients={recipients}
+            parentMessageId={sp.parentId}
+            defaultReceiverId={sp.receiverId}
+            defaultSubject={sp.subject}
+          />
+        </SectionErrorBoundary>
+        {/* P2-8: 草稿列表区块独立 ErrorBoundary */}
+        <SectionErrorBoundary namespace="messages">
+          {/* P1-1: 草稿列表 - 允许用户查看、继续编辑、删除未发送的草稿 */}
+          <MessageDraftList drafts={drafts} />
+        </SectionErrorBoundary>
       </div>
     </div>
   )