fix: add trailing edge to scroll throttle

Ensures the chat scrolls to the bottom after streaming ends, even if
the last messages update arrives during the 150ms throttle window.

components/chat-message-display.tsx

@@ -417,6 +417,7 @@ export function ChatMessageDisplay({
 
     // Track previous message count to detect bulk loads vs streaming
     const prevMessageCountRef = useRef(0)
+    const scrollThrottleRef = useRef<ReturnType<typeof setTimeout> | null>(null)
 
     useEffect(() => {
         if (messagesEndRef.current && messages.length > 0) {
@@ -430,8 +431,17 @@ export function ChatMessageDisplay({
                 return
             }
 
-            // Single message added - smooth scroll
+            // Throttle scroll during streaming to avoid layout thrashing
+            // Leading + trailing: scroll immediately, then once more after cooldown
+            if (!scrollThrottleRef.current) {
                 messagesEndRef.current.scrollIntoView({ behavior: "smooth" })
+                scrollThrottleRef.current = setTimeout(() => {
+                    scrollThrottleRef.current = null
+                    messagesEndRef.current?.scrollIntoView({
+                        behavior: "smooth",
+                    })
+                }, 150)
+            }
         }
     }, [messages])
 

components/chat/ToolCallCard.tsx

@@ -195,7 +195,22 @@ export function ToolCallCard({
             {input && isExpanded && (
                 <div className="px-4 py-3 border-t border-border/40 bg-muted/20">
                     {typeof input === "object" && input.xml ? (
+                        state === "input-streaming" ||
+                        state === "input-available" ? (
+                            <pre
+                                className="text-[11px] leading-relaxed overflow-x-auto overflow-y-auto max-h-48 scrollbar-thin break-all whitespace-pre-wrap"
+                                style={{
+                                    fontFamily:
+                                        "var(--font-mono), ui-monospace, monospace",
+                                    margin: 0,
+                                    padding: 0,
+                                }}
+                            >
+                                {input.xml}
+                            </pre>
+                        ) : (
                             <CodeBlock code={input.xml} language="xml" />
+                        )
                     ) : typeof input === "object" &&
                       input.operations &&
                       Array.isArray(input.operations) ? (