fix: remove unnecessary showTitlePreview from useCallback deps

apps/web/src/pages/generate/GeneratePage.tsx

@@ -28,8 +28,6 @@ import { useGenerateFormState } from "./hooks/useGenerateFormState"
 import { useStepNavigation } from "./hooks/useStepNavigation"
 import { useGenerateVideo } from "./hooks/useGenerateVideo"
 import { useStep5Preview } from "./hooks/useStep5Preview"
-import { useQuery } from "@tanstack/react-query"
-import { getAssetsByKind } from "@/api/assets"
 import "./generate.css"
 
 const GeneratePage: React.FC = () => {
@@ -267,6 +265,7 @@ const GeneratePage: React.FC = () => {
               onRegenerate={step5Preview.regeneratePreview}
               titleText={titleSettings.title}
               titleSettings={titleSettings}
+              showTitlePreview={currentStep === 4}
               sourceVideoUrl={sourceVideoUrl}
             />
           )}

apps/web/src/pages/generate/components/PreviewVideoPanel.tsx

@@ -29,6 +29,8 @@ interface PreviewVideoPanelProps {
   titleText?: string
   /** 标题样式设置 */
   titleSettings?: TitleSettings
+  /** Step4 标题预览模式 */
+  showTitlePreview?: boolean
   /** 素材视频 URL（用于 Step4 标题预览背景） */
   sourceVideoUrl?: string
 }
@@ -44,6 +46,7 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
   onRegenerate,
   titleText,
   titleSettings,
+  showTitlePreview,
   sourceVideoUrl,
 }) => {
   const hasPreview = previewStatus === "ready" && previewResult