From 0d8acb38b7e24c5066ea53e69f0790634dcec78c Mon Sep 17 00:00:00 2001
From: xiaoxia <dev@xiaoxiajianji.com>
Date: Thu, 6 Aug 2026 17:35:38 +0800
Subject: [PATCH] =?UTF-8?q?docs:=20=E6=B7=BB=E5=8A=A0=E8=AE=BE=E8=AE=A1?=
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标题预览仅在有视频时显示，无视频状态下不再单独预览标题。
---
 apps/web/src/pages/generate/components/PreviewVideoPanel.tsx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apps/web/src/pages/generate/components/PreviewVideoPanel.tsx b/apps/web/src/pages/generate/components/PreviewVideoPanel.tsx
index 723a44545..8de11fbf7 100644
--- a/apps/web/src/pages/generate/components/PreviewVideoPanel.tsx
+++ b/apps/web/src/pages/generate/components/PreviewVideoPanel.tsx
@@ -2,6 +2,9 @@
  * 右侧预览视频面板
  * Step3 生成预览后常驻显示预览视频
  * Step4+ 用 Canvas 绘制标题预览（替代 CSS overlay，与 ASS 渲染行为一致）
+ *
+ * 设计说明：标题预览仅在有视频时显示（叠加在视频画面上方）。
+ * 无视频状态（idle/loading/error）下不再单独显示标题预览，这是有意为之的设计简化。
  */
 import React, { useRef, useEffect, useCallback } from "react"
 import { PlayCircleOutlined, LoadingOutlined } from "@ant-design/icons"