feat: add rate limit for authentication

* improve error handling in frontend

app/src/utils/errors.js

@@ -0,0 +1,27 @@
+/* eslint-disable max-classes-per-file */
+export class TooManyRequestsError extends Error {
+  constructor(message) {
+    super(message)
+    this.name = 'TooManyRequestsError'
+  }
+}
+
+export class ValidationError extends Error {
+  constructor(message) {
+    super(message)
+    this.name = 'ValidationError'
+  }
+}
+
+export class UnauthorizedError extends Error {
+  constructor(message) {
+    super(message)
+    this.name = 'UnauthorizedError'
+  }
+}
+
+export default {
+  TooManyRequestsError,
+  ValidationError,
+  UnauthorizedError,
+}