Implement login, add useUser hook

requests/sendLoginUserRequest.tsx

@@ -0,0 +1,28 @@
+import { BasicUserInfoSchema } from '@/config/auth/types';
+import APIResponseValidationSchema from '@/validation/APIResponseValidationSchema';
+
+const sendLoginUserRequest = async (data: { username: string; password: string }) => {
+  const response = await fetch('/api/users/login', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify(data),
+  });
+
+  const json: unknown = await response.json();
+
+  const parsed = APIResponseValidationSchema.safeParse(json);
+  if (!parsed.success) {
+    throw new Error('API response validation failed');
+  }
+
+  const parsedPayload = BasicUserInfoSchema.safeParse(parsed.data.payload);
+  if (!parsedPayload.success) {
+    throw new Error('API response payload validation failed');
+  }
+
+  return parsedPayload.data;
+};
+
+export default sendLoginUserRequest;