fix(render-page): register completion without requiring a download URL

The full-screen render page only transitioned to "completed" when status was
completed AND an outputUrl existed, so dev renders (which produce no export file)
polled forever at 100%. Now completion is driven by status alone; the download/
share buttons render only when a URL is present, otherwise a "dev render, no file"
note is shown. Same guard helps real renders whose export URL resolves a beat late.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/[locale]/studio/render/[projectId]/page.tsx

@@ -109,8 +109,8 @@ export default function RenderPage() {
         setProgressMessage(data.progressMessage ?? `Rendering… ${data.progress}%`);
         if (data.previewB64) setPreviewB64(data.previewB64);
 
-        if (data.status === "completed" && data.outputUrl) {
-          setOutputUrl(data.outputUrl);
+        if (data.status === "completed") {
+          if (data.outputUrl) setOutputUrl(data.outputUrl);
           setProgress(100);
           setPhase("completed");
         } else if (data.status === "failed") {
@@ -219,10 +219,12 @@ export default function RenderPage() {
         </div>
 
         {/* State-specific panel */}
-        {phase === "completed" && outputUrl ? (
+        {phase === "completed" ? (
           <div className="w-full max-w-md space-y-3 text-center">
             <p className="text-lg font-semibold text-emerald-400">ویدیوی شما آماده است!</p>
             <div className="flex flex-col gap-2">
+              {outputUrl ? (
+                <>
                   <a
                     href={outputUrl}
                     download
@@ -240,6 +242,13 @@ export default function RenderPage() {
                     <Link2 className="h-4 w-4" />
                     لینک اشتراک‌گذاری
                   </a>
+                </>
+              ) : (
+                <p className="rounded-lg border border-[#2a2d3e] bg-[#0c0e1a] px-3 py-2.5 text-xs text-gray-400">
+                  رندر در محیط توسعه کامل شد (بدون فایل خروجی واقعی). در محیط تولید، لینک دانلود اینجا
+                  نمایش داده می‌شود.
+                </p>
+              )}
               <Link
                 href={backToStudio}
                 className="mt-1 text-xs text-gray-500 hover:text-gray-300"