fix(reels): auto-scroll advances photo reels after 5s

Photo posts have no onEnded event (video-only), so auto-scroll never
advanced past them. Added a 5s timer (isActive && autoScrollEnabled &&
type !== "video") calling onRequestNext, mirroring the video's onEnded.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/components/posts/ReelsPostCard.tsx

@@ -156,6 +156,14 @@ export default function ReelsPostCard({
   const playbackSpeed = exploreUi ? exploreUi.playbackSpeed : 1;
   const allowSave = postData.author_allow_save !== false;
 
+  // عکس onEnded نداره (فقط ویدیو) — با پیمایش خودکار فعال، بعد از ۵ ثانیه خودش می‌ره
+  // ریلز بعدی؛ اگه این پست ویدیوعه این تایمر کاری نمی‌کنه (onEnded خودِ ویدیو مسئوله)
+  useEffect(() => {
+    if (!isActive || !autoScrollEnabled || type === "video") return;
+    const timer = window.setTimeout(() => onRequestNext?.(), 5000);
+    return () => window.clearTimeout(timer);
+  }, [isActive, autoScrollEnabled, type, onRequestNext]);
+
   const useCommentsSheet = !postPage;
   const anyCommentsOpen = commentsOpen || commentsModalOpen;
   const showLongVideoBar =