Better header editor and added completion data

src-web/components/ParameterEditor.tsx

@@ -0,0 +1,11 @@
+import type { HttpRequest } from '../lib/models';
+import { PairEditor } from './core/PairEditor';
+
+type Props = {
+  parameters: { name: string; value: string }[];
+  onChange: (headers: HttpRequest['headers']) => void;
+};
+
+export function ParametersEditor({ parameters, onChange }: Props) {
+  return <PairEditor pairs={parameters} onChange={onChange} namePlaceholder="param_name" />;
+}