feat: add delete functionality with confirmation dialog and Ctrl+S shortcut

- Added `@HostListener` for `window:keydown.control.s` to trigger the update service using the Ctrl+S shortcut.
- Added `@HostListener` for `window:keydown.delete` to handle item deletion via keyboard.
- Implemented `deleteItem` method with SweetAlert2 confirmation dialog before deleting selected items.
- Integrated `forkJoin` for simultaneous handling of multiple delete requests and appropriate success/error notifications.

DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/pages/group/group.component.ts

@@ -1,4 +1,4 @@
-import { AfterViewInit, Component, ViewChild } from '@angular/core';
+import { AfterViewInit, Component, ViewChild, HostListener } from '@angular/core';
 import { GroupTableComponent } from '../../components/tables/group-table/group-table.component';
 import { UserTableComponent } from '../../components/tables/user-table/user-table.component';
 import { MatTabsModule } from '@angular/material/tabs';
@@ -6,7 +6,8 @@ import { GuiCellEdit, GuiSelectedRow } from '@generic-ui/ngx-grid';
 import { GroupFormComponent } from '../../components/forms/group-form/group-form.component';
 import { BasePageComponent } from '../base-page/base-page.component';
 import { Group } from '../../models/user-management.api.models';
-import { firstValueFrom } from 'rxjs';
+import { firstValueFrom, forkJoin } from 'rxjs';
+import Swal from 'sweetalert2';
 
 @Component({
   standalone: true,
@@ -53,4 +54,45 @@ export class GroupComponent extends BasePageComponent implements AfterViewInit {
         this.userTable.fetchDataByGroupId(this.sGroupId);
     }
   }
+
+  @HostListener('window:keydown.control.s', ['$event'])
+  handleCtrlS(event: KeyboardEvent) {
+    event.preventDefault();
+    this.updateService.executeAll();
+  }
+
+  @HostListener('window:keydown.delete', ['$event'])
+  handleDelete(event: KeyboardEvent) {
+    this.deleteItem();
+  }
+
+  deleteItem() {
+    const sRows = this.groupTable.selectedRows;
+    if (sRows.length > 0)
+      Swal.fire({
+        title: "Löschen bestätigen",
+        html: `<p class="text-start">Dieser Vorgang ist unwiderruflich. Möchten Sie fortfahren?<br><br>Anzahl der zu löschenden Einträge: ${sRows.length}</p>`,
+        showDenyButton: true,
+        confirmButtonText: "Ja",
+        denyButtonText: `Nein`
+      }).then((result) => {
+        if (result.isConfirmed) {
+          const deleteRequests = sRows.map(sRow => this.groupTable.service.delete(sRow.source.id!));
+          forkJoin(deleteRequests).subscribe({
+            next: () => {
+              this.refreshService.executeAll(),
+                Swal.fire({
+                  text: `${sRows.length} Einträge wurden erfolgreich gelöscht.`,
+                  icon: "success"
+                })
+            },
+            error: err => Swal.fire({
+              title: "Fehler",
+              text: `${err.message}`,
+              icon: "error"
+            })
+          });
+        }
+      });
+  }
 }