feat(admin): finalize live show settings and related tests

tests/Feature/Tenant/LiveShowLinkControllerTest.php

@@ -62,4 +62,32 @@ class LiveShowLinkControllerTest extends TenantTestCase
         $this->assertIsString($rotatedToken);
         $this->assertNotSame($firstToken, $rotatedToken);
     }
+
+    public function test_loading_live_show_link_does_not_mutate_existing_expiry(): void
+    {
+        $this->freezeTime(function (): void {
+            $event = Event::factory()
+                ->for($this->tenant)
+                ->create([
+                    'name' => ['de' => 'Live-Show Ablauf', 'en' => 'Live Show Expiry'],
+                    'slug' => 'live-show-fixed-expiry',
+                    'date' => now()->addDays(3)->startOfDay(),
+                ]);
+            $event->ensureLiveShowToken();
+            $customExpiry = now()->addHours(4)->toImmutable();
+            $event->forceFill(['live_show_token_expires_at' => $customExpiry])->saveQuietly();
+
+            $first = $this->authenticatedRequest('GET', "/api/v1/tenant/events/{$event->slug}/live-show/link");
+            $first->assertOk();
+            $firstExpiry = $first->json('data.expires_at');
+
+            $this->travel(8)->hours();
+
+            $second = $this->authenticatedRequest('GET', "/api/v1/tenant/events/{$event->slug}/live-show/link");
+            $second->assertOk();
+
+            $this->assertIsString($firstExpiry);
+            $this->assertSame($firstExpiry, $second->json('data.expires_at'));
+        });
+    }
 }