feat(back-end and front-end) cad bill with order

frontend/src/app/features/admin/pages/admin-sessions.component.ts

@@ -135,6 +135,42 @@ export class AdminSessionsComponent implements OnInit {
     return `${hours}h ${minutes}m`;
   }
 
+  copySessionUuid(sessionId: string): void {
+    if (!sessionId) {
+      return;
+    }
+
+    if (navigator.clipboard?.writeText) {
+      navigator.clipboard.writeText(sessionId).then(
+        () => {
+          this.errorMessage = null;
+          this.successMessage = 'UUID sessione copiato.';
+        },
+        () => {
+          this.errorMessage = 'Impossibile copiare UUID sessione.';
+        },
+      );
+      return;
+    }
+
+    // Fallback for older browsers.
+    const textarea = document.createElement('textarea');
+    textarea.value = sessionId;
+    textarea.style.position = 'fixed';
+    textarea.style.opacity = '0';
+    document.body.appendChild(textarea);
+    textarea.select();
+    try {
+      document.execCommand('copy');
+      this.errorMessage = null;
+      this.successMessage = 'UUID sessione copiato.';
+    } catch {
+      this.errorMessage = 'Impossibile copiare UUID sessione.';
+    } finally {
+      document.body.removeChild(textarea);
+    }
+  }
+
   private extractErrorMessage(error: unknown, fallback: string): string {
     const err = error as { error?: { message?: string } };
     return err?.error?.message || fallback;