fix(web): remove the '* cheatcode' name label entirely from assistant messages

Follow-up to the working-animation change: the owner wants the 'cheatcode' label
gone for good, not just replaced while streaming. AssistantHeader now renders the
working animation ONLY while the message is streaming and renders NOTHING once it's
done (previously it restored the '* cheatcode' label). Verified live: no name label
in finished messages; working animation still shows during streaming. Gate green.

Author: iamjr15

apps/web/src/components/chat/message-list.tsx

@@ -129,28 +129,23 @@ function MessageBubble({
   );
 }
 
-// While the run streams, the header shows the "Working • Ns" animation; when the run ends
-// it restores the static "* cheatcode" label. `streaming` is true only for the last
-// assistant message during a live run, so the label auto-restores on completion.
+// While the run streams, the header shows the "Working • Ns" animation; once the message
+// is done there is NO header at all (the static "* cheatcode" label is intentionally
+// removed). `streaming` is true only for the last assistant message during a live run.
 function AssistantHeader({
   elapsedSeconds,
   streaming,
 }: {
   elapsedSeconds: number;
   streaming: boolean;
 }) {
-  if (streaming) {
-    return (
-      <WorkingIndicator
-        className="mb-3 flex items-center gap-2 text-[#a0a0a0] text-[13px]"
-        elapsedSeconds={elapsedSeconds}
-      />
-    );
+  if (!streaming) {
+    return null;
   }
   return (
-    <div className="mb-3 flex items-center gap-2 text-[13px]">
-      <span className="text-[#f8af2c]">*</span>
-      <span className="font-semibold text-[#1b1b1b]">cheatcode</span>
-    </div>
+    <WorkingIndicator
+      className="mb-3 flex items-center gap-2 text-[#a0a0a0] text-[13px]"
+      elapsedSeconds={elapsedSeconds}
+    />
   );
 }