style: remove default prompt display from scene fusion UI

components/scene-fusion-view.tsx

@@ -555,14 +555,6 @@ export function SceneFusionView({ onBack }: SceneFusionViewProps) {
             </div>
           </ScrollArea>
           
-          {/* 默认提示词提示 */}
-          <div className="px-4 py-2 border-t bg-muted/30">
-            <p className="text-xs text-muted-foreground">
-              <span className="font-medium">默认提示词：</span>
-              {defaultPrompt.length > 60 ? `${defaultPrompt.substring(0, 60)}...` : defaultPrompt}
-            </p>
-          </div>
-          
           <div className="p-4 border-t bg-background">
             <Button 
               className="w-full"