完善观众端目录与回放状态降级

frontend/src/admin/pages/ReplayEditor.tsx

@@ -63,7 +63,7 @@ export default function ReplayEditor() {
   if (!stream) return <Alert type="error" message="节目不存在" />
 
   return (
-    <div style={{ maxWidth: 980, margin: '0 auto', padding: '8px 0 48px' }}>
+    <div className="replay-editor" style={{ maxWidth: 980, margin: '0 auto', padding: '8px 0 48px', minWidth: 0 }}>
       <Button type="text" icon={<ArrowLeftOutlined />} onClick={() => navigate('/admin/streams')} style={{ marginBottom: 20 }}>返回节目列表</Button>
       <Title level={2} style={{ marginBottom: 4 }}>回放与章节</Title>
       <Text type="secondary">{stream.title}</Text>
@@ -88,12 +88,12 @@ export default function ReplayEditor() {
           <Button icon={<PlusOutlined />} onClick={addChapter} disabled={!replayFile}>按当前播放时间添加章节</Button>
           <Space direction="vertical" style={{ width: '100%' }}>
             {chapters.map((chapter, index) => (
-              <Space key={index} wrap style={{ width: '100%' }}>
+              <Space key={index} wrap className="replay-chapter-row" style={{ width: '100%', minWidth: 0 }}>
                 <Input
                   value={chapter.title}
                   placeholder="章节标题"
                   onChange={event => setChapters(current => current.map((item, i) => i === index ? { ...item, title: event.target.value } : item))}
-                  style={{ width: 320, maxWidth: '100%' }}
+                  style={{ width: 320, maxWidth: '100%', flex: '1 1 220px' }}
                 />
                 <InputNumber
                   min={0}