fix: reset scroll position when switching articles

Reset scroll position to top immediately when articleIdentifier changes
to prevent showing wrong scroll position from previous article. Also
reset hasAttemptedRestoreRef when article changes to ensure proper
scroll restoration for new articles.

src/components/ContentPanel.tsx

@@ -263,6 +263,15 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
   const restoreKey = `${articleIdentifier}-${isTrackingEnabled}`
   const hasAttemptedRestoreRef = useRef<string | null>(null)
 
+  // Reset scroll position and restore ref when article changes
+  useEffect(() => {
+    // Reset scroll to top when article identifier changes
+    // This prevents showing wrong scroll position from previous article
+    window.scrollTo({ top: 0, behavior: 'instant' })
+    // Reset restore attempt tracking for new article
+    hasAttemptedRestoreRef.current = null
+  }, [articleIdentifier])
+
   useEffect(() => {
     if (!isTextContent || !activeAccount || !articleIdentifier) {
       return