Update src/app/page.tsx

Merge version_2 into main

src/app/page.tsx

@@ -204,6 +204,7 @@ export default function LandingPage() {
         name: "message",        placeholder: "Attach payment proof description"}}
       imageSrc="http://img.b2bpic.net/free-photo/modern-office-with-nobody-present_482257-122002.jpg"
       onSubmit={(data) => {
+          alert("Payment proof received. Your order is being processed!");
           console.log("Order submitted:", data);
           // Simulate delivery
           navigator.clipboard.writeText("https://example.com/download/template.pptx");