Show ADD TO PLAYLIST for podcast episodes and audiobooks (#1474)

* Add ADD TO PLAYLIST menu support for podcasts and audiobooks

Extend the playlist functionality (originally added for radio stations in
PR #1356) to also support podcasts, podcast episodes, and audiobooks.
Like radio stations, these items can only be added to playlists stored
in the builtin provider.

https://claude.ai/code/session_01Pme3UUJzT29ZfaJ752c8QM

* Remove PODCAST from playlist menu support, keep only PODCAST_EPISODE

Only podcast episodes (not the podcast itself) can be added to playlists.

https://claude.ai/code/session_01Pme3UUJzT29ZfaJ752c8QM

* Use firstItem instead of items[0] in playlist menu checks

Consistent with the existing firstItem const defined at the top of
getContextMenuItems, which is guarded by the early return on empty items.

https://claude.ai/code/session_01Pme3UUJzT29ZfaJ752c8QM

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Steven Travers <steven.travers20@gmail.com>

Author: 3 people

src/layouts/default/AddToPlaylistDialog.vue

@@ -141,8 +141,11 @@ const fetchPlaylists = async function () {
     );
   }
 
-  // Check if we're adding radio items - radio can only be added to builtin playlists
-  const isAddingRadio = refItem?.media_type === MediaType.RADIO;
+  // Check if we're adding radio/podcast/audiobook items - these can only be added to builtin playlists
+  const isAddingBuiltinOnly =
+    refItem?.media_type === MediaType.RADIO ||
+    refItem?.media_type === MediaType.PODCAST_EPISODE ||
+    refItem?.media_type === MediaType.AUDIOBOOK;
 
   for (const playlist of playlistResults) {
     // skip unavailable playlists
@@ -160,8 +163,8 @@ const fetchPlaylists = async function () {
     const playListProvider =
       api.providers[playlist.provider_mappings[0].provider_instance];
 
-    // For radio items, only show builtin playlists
-    if (isAddingRadio) {
+    // For radio/podcast/audiobook items, only show builtin playlists
+    if (isAddingBuiltinOnly) {
       if (playListProvider && playListProvider.domain == "builtin") {
         playlists.value.push(playlist);
       }
@@ -189,8 +192,8 @@ const fetchPlaylists = async function () {
       )
     )
       continue;
-    // For radio items, only allow builtin provider
-    if (isAddingRadio) {
+    // For radio/podcast/audiobook items, only allow builtin provider
+    if (isAddingBuiltinOnly) {
       if (provider.domain == "builtin") {
         createPlaylistProviders.value.push(provider.instance_id);
       }

src/layouts/default/ItemContextMenu.vue

@@ -839,12 +839,14 @@ export const getContextMenuItems = async function (
     }
   }
 
-  // remove from playlist (playlist tracks and radio items)
+  // remove from playlist (playlist tracks, radio, podcast, podcast episode, and audiobook items)
   if (parentItem && parentItem.media_type === MediaType.PLAYLIST) {
     const playlist = parentItem as Playlist;
     if (
-      (items[0].media_type === MediaType.TRACK ||
-        items[0].media_type === MediaType.RADIO) &&
+      (firstItem.media_type === MediaType.TRACK ||
+        firstItem.media_type === MediaType.RADIO ||
+        firstItem.media_type === MediaType.PODCAST_EPISODE ||
+        firstItem.media_type === MediaType.AUDIOBOOK) &&
       playlist.is_editable
     ) {
       contextMenuItems.push({
@@ -860,11 +862,13 @@ export const getContextMenuItems = async function (
       });
     }
   }
-  // add to playlist action (tracks, albums, and radios)
+  // add to playlist action (tracks, albums, radios, podcasts, podcast episodes, and audiobooks)
   if (
-    items[0].media_type === MediaType.TRACK ||
-    items[0].media_type === MediaType.ALBUM ||
-    items[0].media_type === MediaType.RADIO
+    firstItem.media_type === MediaType.TRACK ||
+    firstItem.media_type === MediaType.ALBUM ||
+    firstItem.media_type === MediaType.RADIO ||
+    firstItem.media_type === MediaType.PODCAST_EPISODE ||
+    firstItem.media_type === MediaType.AUDIOBOOK
   ) {
     contextMenuItems.push({
       label: "add_playlist",

src/plugins/api/index.ts

@@ -707,7 +707,7 @@ export class MusicAssistantApi {
     item_id: string,
     provider_instance_id_or_domain: string,
     force_refresh?: boolean,
-  ): Promise<(Track | Radio)[]> {
+  ): Promise<(Track | Radio | PodcastEpisode | Audiobook)[]> {
     return this.sendCommand("music/playlists/playlist_tracks", {
       item_id,
       provider_instance_id_or_domain,