chore: import upstream snapshot with attribution

packages/angular/src/lib/components/chat/copilot-chat-reasoning-message-utils.ts

@@ -0,0 +1,9 @@
+export function formatReasoningDuration(seconds: number): string {
+  if (seconds < 1) return "a few seconds";
+  if (seconds < 60) return `${Math.round(seconds)} seconds`;
+
+  const mins = Math.floor(seconds / 60);
+  const secs = Math.round(seconds % 60);
+  if (secs === 0) return `${mins} minute${mins > 1 ? "s" : ""}`;
+  return `${mins}m ${secs}s`;
+}