Update design of Collections list page (#38822)

app/javascript/mastodon/utils/has_react_children.ts

@@ -0,0 +1,12 @@
+import { Children } from 'react';
+import type { ReactNode } from 'react';
+
+export function hasReactChildren(children: ReactNode): boolean {
+  if (!children) {
+    return false;
+  }
+
+  const childrenCount = Children.toArray(children).filter(Boolean).length;
+
+  return childrenCount > 0;
+}