fix: pass titleText to cover generation API in useStep6Cover

apps/web/src/pages/generate/hooks/useStep6Cover.ts

@@ -21,6 +21,8 @@ interface UseStep6CoverProps {
   assetIds?: string[]
   /** 当前选中的模板 ID */
   selectedTemplate?: string
+  /** Step 5 用户选择的标题文字，叠加到封面图上 */
+  titleText?: string
 }
 
 export function useStep6Cover({
@@ -29,6 +31,7 @@ export function useStep6Cover({
   duration,
   assetIds = [],
   selectedTemplate = "",
+  titleText = "",
 }: UseStep6CoverProps) {
   const [generating, setGenerating] = useState(false)
 
@@ -91,6 +94,7 @@ export function useStep6Cover({
       const response = await generateCover(selectedTemplate, {
         asset_ids: assetIds,
         cover_type: "ai_frame",
+        title_text: titleText || undefined,
       })
       clearTimeout(timeoutId)
       const thumbnailUrl = response.cover?.image_url || ""
@@ -133,7 +137,7 @@ export function useStep6Cover({
       clearTimeout(timeoutId)
       setGenerating(false)
     }
-  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange, generating])
+  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange, generating, titleText])
 
   // ── 模板操作方法 ──
   const handleSelectTemplate = useCallback((id: string) => {