feat: improve structure and error handling

app/[lang]/(live)/middleware-error/[status]/page.module.css

@@ -0,0 +1,3 @@
+.layout {
+  font-family: var(--ff-fira-sans);
+}

app/[lang]/(live)/middleware-error/[status]/page.tsx

@@ -0,0 +1,17 @@
+import { firaMono, firaSans } from "@/app/[lang]/(live)/fonts"
+
+import styles from "./page.module.css"
+
+import { LangParams, LayoutArgs, StatusParams } from "@/types/params"
+
+export default function MiddlewareError({
+  params,
+}: LayoutArgs<LangParams & StatusParams>) {
+  return (
+    <div
+      className={`${firaMono.variable} ${firaSans.variable} ${styles.layout}`}
+    >
+      Middleware Error {params.lang}: {params.status}
+    </div>
+  )
+}