feat: user can set and update username with 2 step authentication

src/app/_util/otp.ts

@@ -10,11 +10,12 @@ interface SendOtpPayload {
   date?: string;
   userOtp?: string;
   username?: string;
+  PreferName?: string;
 }
 
 function getStoredMobileNumber(): string {
-  const mobileNumber = localStorage.getItem('remitter_mobile_no');
-  // const mobileNumber = "7890544527";
+  // const mobileNumber = localStorage.getItem('remitter_mobile_no');
+  const mobileNumber = "6297421727";
   if (!mobileNumber) throw new Error('Mobile number not found.');
   return mobileNumber;
 }