fix: prevent direct playback of single-item playlists

Update `isNavigable` to explicitly validate `item.is_container` and disable navigation for playlists with only one item. This forces users to enter the playlist container, preserving metadata update benefits.

pmoapp/webapp/src/components/unified/ServerDrawer.vue

@@ -289,8 +289,12 @@ function isPlayable(item: ContainerEntry): boolean {
 
 // Détermine si un container est navigable
 function isNavigable(item: ContainerEntry): boolean {
-    // Tous les containers sont navigables (on laisse le serveur décider si vide)
-    return item.is_container;
+    if (!item.is_container) return false;
+    // Une playlist avec un seul item : on garde le caractère jouable mais on retire
+    // la navigation pour éviter que l'utilisateur joue l'item directement et perde
+    // le bénéfice des mises à jour de métadonnées de la playlist.
+    if (isPlayable(item) && item.child_count === 1) return false;
+    return true;
 }
 
 function handleItemClick(item: ContainerEntry) {

pmocontrol/src/media_server.rs

@@ -373,6 +373,7 @@ pub struct MediaEntry {
     pub is_container: bool,
     pub class: String,
     pub resources: Vec<MediaResource>,
+    pub child_count: Option<u32>,
     pub artist: Option<String>,
     pub album: Option<String>,
     pub genre: Option<String>,
@@ -709,6 +710,7 @@ fn map_didl_entries(xml: &str) -> Result<Vec<MediaEntry>, ControlPointError> {
             is_container: true,
             class: container.class,
             resources: Vec::new(),
+            child_count: container.child_count.as_deref().and_then(|s| s.parse().ok()),
             artist: container.artist,
             album: None,
             genre: None,
@@ -742,6 +744,7 @@ fn map_didl_entries(xml: &str) -> Result<Vec<MediaEntry>, ControlPointError> {
             is_container: false,
             class: item.class,
             resources,
+            child_count: None,
             artist: item.artist,
             album: item.album,
             genre: item.genre,

pmocontrol/src/pmoserver_ext.rs

@@ -2211,7 +2211,7 @@ async fn browse_container(
             title: e.title,
             class: e.class,
             is_container: e.is_container,
-            child_count: None,
+            child_count: e.child_count,
             artist: e.artist,
             album: e.album,
             album_art_uri,
@@ -2496,7 +2496,7 @@ async fn search_server(
             title: e.title,
             class: e.class,
             is_container: e.is_container,
-            child_count: None,
+            child_count: e.child_count,
             artist: e.artist,
             album: e.album,
             album_art_uri: e.album_art_uri,