feat(web): make google cast opt in (#18514)

* add setting switch

this isnt bound to anything yet

* make google casting opt-in

* doc updates

* lint docs

* remove unneeded translation items

* update mobile openai defs

* fix failing test

we need to mock user prefs since CastButton uses it

web/src/test-data/factories/preferences-factory.ts

@@ -0,0 +1,43 @@
+import type { UserPreferencesResponseDto } from '@immich/sdk';
+import { Sync } from 'factory.ts';
+
+export const preferencesFactory = Sync.makeFactory<UserPreferencesResponseDto>({
+  cast: {
+    gCastEnabled: false,
+  },
+  download: {
+    archiveSize: 0,
+    includeEmbeddedVideos: false,
+  },
+  emailNotifications: {
+    albumInvite: false,
+    albumUpdate: false,
+    enabled: false,
+  },
+  folders: {
+    enabled: false,
+    sidebarWeb: false,
+  },
+  memories: {
+    enabled: false,
+  },
+  people: {
+    enabled: false,
+    sidebarWeb: false,
+  },
+  purchase: {
+    hideBuyButtonUntil: '',
+    showSupportBadge: false,
+  },
+  ratings: {
+    enabled: false,
+  },
+  sharedLinks: {
+    enabled: false,
+    sidebarWeb: false,
+  },
+  tags: {
+    enabled: false,
+    sidebarWeb: false,
+  },
+});