feat: implement modal service and components for enhanced user interaction, including modal showcase in demo page

src/app/app.ts

@@ -3,6 +3,7 @@ import { RouterOutlet } from '@angular/router';
 
 import { TenantService } from './core/services/tenant.service';
 import { DEFAULT_TENANT_BRANDING } from './core/services/tenant-ssr-cache.store';
+import { ModalHostComponent } from './shared/components/modal-host/modal-host.component';
 import { ToastContainerComponent } from './shared/components/toast-container/toast-container.component';
 
 function hexToRgb(hex: string): string {
@@ -22,7 +23,7 @@ function hexToRgb(hex: string): string {
 
 @Component({
   selector: 'app-root',
-  imports: [RouterOutlet, ToastContainerComponent],
+  imports: [RouterOutlet, ToastContainerComponent, ModalHostComponent],
   templateUrl: './app.html',
   styleUrl: './app.scss',
   host: {