refactor: cast button (#25101)

web/src/lib/services/app.service.ts

@@ -0,0 +1,19 @@
+import { CastDestinationType, castManager } from '$lib/managers/cast-manager.svelte';
+import { GCastDestination } from '$lib/utils/cast/gcast-destination.svelte';
+import type { ActionItem } from '@immich/ui';
+import { mdiCast, mdiCastConnected } from '@mdi/js';
+import type { MessageFormatter } from 'svelte-i18n';
+
+export const getGlobalActions = ($t: MessageFormatter) => {
+  const Cast: ActionItem = {
+    title: $t('cast'),
+    icon: castManager.isCasting ? mdiCastConnected : mdiCast,
+    color: castManager.isCasting ? 'primary' : 'secondary',
+    $if: () =>
+      castManager.availableDestinations.length > 0 &&
+      castManager.availableDestinations[0].type === CastDestinationType.GCAST,
+    onAction: () => void GCastDestination.showCastDialog(),
+  };
+
+  return { Cast };
+};