feat: implement text diff tool

app/text/diff/layout.tsx

@@ -0,0 +1,17 @@
+import { Metadata } from "next";
+
+import { toolGroups } from "@/config/tools";
+
+export const metadata: Metadata = {
+  title: toolGroups.text.tools.inspector_and_case_converter.longTitle,
+  description: toolGroups.text.tools.inspector_and_case_converter.description,
+  robots: {
+    googleBot: {
+      index: true,
+    },
+  },
+};
+
+export default function Layout({ children }: { children: React.ReactNode }) {
+  return children;
+}