Chat panel follows its tail by scrolling its own body (SidePanel body gets data-slot side-panel-body) instead of scrollIntoView, which scrolls every ancestor

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/components/Chat/ChatPanel.tsx

@@ -179,7 +179,10 @@ export function ChatPanel() {
   const tailLength = tail && "text" in tail ? tail.text.length : 0
   // biome-ignore lint/correctness/useExhaustiveDependencies: scroll when the list or a streamed answer grows, not on every render.
   useEffect(() => {
-    bottom.current?.scrollIntoView({ block: "end" })
+    // Only the panel's body moves: `scrollIntoView` would scroll every
+    // ancestor too, which is how the logs panel slid the code editor away.
+    const body = bottom.current?.closest("[data-slot=side-panel-body]")
+    body?.scrollTo({ top: body.scrollHeight })
   }, [shown.length, tailLength, waiting])
 
   const send = async () => {

frontend/src/components/Flow/SidePanel.tsx

@@ -252,6 +252,7 @@ export function SidePanel({
       </div>
 
       <div
+        data-slot="side-panel-body"
         className={cn(
           "flex min-h-0 flex-1 flex-col",
           expanded ? "overflow-hidden" : "overflow-y-auto",