fix: use consistent fixed height for theme styling preview

Use a single 660px fixed height for the theme styling preview container
for both app and link survey types, replacing the previous conditional
height that left the link survey preview too short.

apps/web/modules/ui/components/theme-styling-preview-survey/index.tsx

@@ -92,7 +92,7 @@ export const ThemeStylingPreviewSurvey = ({
     },
     shrink: {
       width: ["83.33%"],
-      height: isAppSurvey ? ["600px"] : "auto", // Fixed height for App survey visibility
+      height: ["660px"],
     },
   };
 
@@ -148,7 +148,8 @@ export const ThemeStylingPreviewSurvey = ({
         }
         className={cn(
           "relative z-10 flex w-5/6 flex-col rounded-lg border border-slate-300 shadow-xl",
-          isAppSurvey ? "h-[600px] max-h-[95%] bg-slate-200" : "h-auto max-h-[85%] overflow-y-auto bg-white"
+          "h-[660px] max-h-[95%]",
+          isAppSurvey ? "bg-slate-200" : "overflow-y-auto bg-white"
         )}>
         <div className="flex h-auto w-full items-center rounded-t-lg bg-slate-100 py-2">
           <div className="ml-6 flex space-x-2">