feat: enhance user confirmation and data submission; add newEntry function and update MainForm to handle user selection

frontend/src/utils/sender.ts

@@ -14,9 +14,9 @@ interface FormData {
   paymentMethod: string;
 }
 
-export const submitFormData = async (data: FormData) => {
+export const submitFormData = async (data: FormData, username: string) => {
   try {
-    const response = await fetch("/backend/default/frontend", {
+    const response = await fetch(`http://localhost:8004/default/new-entry?username=${username}`, {
       method: "POST",
       headers: {
         "Content-Type": "application/json",
@@ -27,7 +27,7 @@ export const submitFormData = async (data: FormData) => {
     if (!response.ok) {
       const errorText = await response.text();
       return { success: false, error: `Server error: ${errorText}` };
-    } 
+    }
 
     return { success: true };
   } catch (error) {