试卷编辑页三处布局优化:头部标题独立成行可换行、网格显式单列+元素自适应、题目编辑表单渲染在被编辑题下方

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/parent/exams/new/page.tsx

@@ -13,11 +13,11 @@ export default async function NewExamPage() {
   return (
     <main className="relative mx-auto max-w-3xl space-y-5 p-4 pb-10">
       <BackgroundBlobs />
-      <header className="flex items-center justify-between">
+      <header className="space-y-2">
         <Link href="/parent/exams" className="text-sm font-medium text-indigo-600">
           ← 试卷列表
         </Link>
-        <h1 className="text-xl font-extrabold text-slate-900">新建试卷</h1>
+        <h1 className="text-xl font-extrabold break-words text-slate-900">新建试卷</h1>
       </header>
       <div className="rounded-2xl border border-slate-100 bg-white p-5 shadow-soft">
         <PaperForm paper={null} isNew />