Restore UI functionalities and clean up dependencies

backendia/dashboard/node_modules/next/dist/lib/is-error.d.ts

@@ -0,0 +1,13 @@
+export interface NextError extends Error {
+    type?: string;
+    page?: string;
+    code?: string | number;
+    cancelled?: boolean;
+    digest?: string;
+}
+/**
+ * Checks whether the given value is a NextError.
+ * This can be used to print a more detailed error message with properties like `code` & `digest`.
+ */
+export default function isError(err: unknown): err is NextError;
+export declare function getProperError(err: unknown): Error;