v1 review pass: fixed some minor bugs

src/components/PageError.tsx

@@ -0,0 +1,17 @@
+import type { ReactNode } from "react";
+import { PageShell } from "./PageShell.tsx";
+
+export function PageError({ message, actions }: {
+  message: string;
+  actions?: ReactNode;
+}) {
+  return (
+    <PageShell>
+      <div className="page-error">
+        <h2>Error</h2>
+        <p>{message}</p>
+        {actions && <div className="page-error-actions">{actions}</div>}
+      </div>
+    </PageShell>
+  );
+}