Add playback subscriber abstraction

src/types/playTarget.ts

@@ -1,3 +1,4 @@
+import type { MediaType } from '@jellyfin/sdk/lib/generated-client/models/media-type';
 import type { UserDto } from '@jellyfin/sdk/lib/generated-client/models/user-dto';
 
 export interface PlayTarget {
@@ -7,5 +8,7 @@ export interface PlayTarget {
     playerName?: string
     deviceType?: string
     isLocalPlayer?: boolean
+    playableMediaTypes: MediaType[]
+    supportedCommands?: string[]
     user?: UserDto
 }