Add SentComponent for form submission confirmation and integrate with email verification flow

frontend/src/app/pages/forms/sent/sent.component.ts

@@ -0,0 +1,28 @@
+import {Component, OnInit} from '@angular/core';
+import {Router} from '@angular/router';
+import {HeaderComponent} from '@header/header.component';
+
+@Component({
+  selector: 'app-sent',
+  imports: [
+    HeaderComponent
+  ],
+  templateUrl: './sent.component.html',
+  styleUrl: './sent.component.scss',
+  standalone: true
+})
+export class SentComponent implements OnInit {
+  protected message: string = "The form is completed and has been sent";
+
+  constructor(private router: Router) {
+  }
+
+  ngOnInit() {
+    const navigation = this.router.getCurrentNavigation();
+    const state = navigation?.extras.state as { message: string };
+
+    if (state?.message) {
+      this.message = state.message;
+    }
+  }
+}