fix(autoplay): advance to the next episode in background audio mode

An episode handed off to the audio-only path for background playback is a
MediaType::Audio item, so autoplay's video-only checks stopped
recognising it as an episode: playback simply ended at the episode
boundary instead of continuing to the next one.

- Carry episode identity (item_type, series_id) through the
  background-audio handoff so the backend queue item still knows it's an
  episode; is_episode_item now trusts item_type over the media_type
  heuristic, and the sleep timer's episode counter follows.
- The frontend normally performs the advance by navigating to
  /player/<id>, which is unavailable while the WebView is suspended.
  advance_to_next_episode_audio_only drives it entirely in the backend:
  fetch the next episode, build its audio-only stream URL, and load it
  into the native audio player, preserving episode identity so the
  following boundary advances too.
- Android's autoplay dispatch routes background-audio episodes to that
  backend advance and keeps the countdown path for the foreground.
- get_audio_only_stream_url_for_video joins the MediaRepository trait
  (online delegates to the existing builder, offline errors) so the
  controller can reach it without a frontend round-trip.

TRACES: UR-040, UR-023 | DR-052 | JA-032

src-tauri/src/repository/hybrid.rs

@@ -641,6 +641,24 @@ impl MediaRepository for HybridRepository {
         self.online.get_audio_stream_url(item_id).await
     }
 
+    async fn get_audio_only_stream_url_for_video(
+        &self,
+        item_id: &str,
+        media_source_id: Option<&str>,
+        start_time_seconds: Option<f64>,
+        audio_stream_index: Option<i32>,
+    ) -> Result<String, RepoError> {
+        // Audio-only transcode of a video requires the server - delegate to online.
+        self.online
+            .build_audio_only_stream_url_for_video(
+                item_id,
+                media_source_id,
+                start_time_seconds,
+                audio_stream_index,
+            )
+            .await
+    }
+
     async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError> {
         // Live TV requires server communication - delegate to online repository
         self.online.get_live_tv_channels().await
@@ -1028,6 +1046,16 @@ mod tests {
             unimplemented!()
         }
 
+        async fn get_audio_only_stream_url_for_video(
+            &self,
+            _item_id: &str,
+            _media_source_id: Option<&str>,
+            _start_time_seconds: Option<f64>,
+            _audio_stream_index: Option<i32>,
+        ) -> Result<String, RepoError> {
+            unimplemented!()
+        }
+
         async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError> {
             unimplemented!()
         }
@@ -1276,6 +1304,16 @@ mod tests {
             unimplemented!()
         }
 
+        async fn get_audio_only_stream_url_for_video(
+            &self,
+            _item_id: &str,
+            _media_source_id: Option<&str>,
+            _start_time_seconds: Option<f64>,
+            _audio_stream_index: Option<i32>,
+        ) -> Result<String, RepoError> {
+            unimplemented!()
+        }
+
         async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError> {
             unimplemented!()
         }

src-tauri/src/repository/mod.rs

@@ -117,6 +117,22 @@ pub trait MediaRepository: Send + Sync {
     /// @req: JA-007 - Get playback info and stream URL
     async fn get_audio_stream_url(&self, item_id: &str) -> Result<String, RepoError>;
 
+    /// Get an audio-only stream URL for a *video* item (background-audio handoff).
+    ///
+    /// Used when autoplay advances to the next episode while the app is playing a
+    /// video in audio-only mode in the background: the backend needs the next
+    /// episode's audio-only URL without any frontend round-trip. Online-only;
+    /// offline/cache repositories return an error.
+    ///
+    /// TRACES: UR-040 | JA-032
+    async fn get_audio_only_stream_url_for_video(
+        &self,
+        item_id: &str,
+        media_source_id: Option<&str>,
+        start_time_seconds: Option<f64>,
+        audio_stream_index: Option<i32>,
+    ) -> Result<String, RepoError>;
+
     /// Get Live TV channels (broadcast / IPTV) for browsing.
     async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError>;
 

src-tauri/src/repository/offline.rs

@@ -1518,6 +1518,17 @@ impl MediaRepository for OfflineRepository {
         Err(RepoError::Offline)
     }
 
+    async fn get_audio_only_stream_url_for_video(
+        &self,
+        _item_id: &str,
+        _media_source_id: Option<&str>,
+        _start_time_seconds: Option<f64>,
+        _audio_stream_index: Option<i32>,
+    ) -> Result<String, RepoError> {
+        // Audio-only transcode requires the server; offline downloads play locally.
+        Err(RepoError::Offline)
+    }
+
     async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError> {
         // Live TV is inherently online-only.
         Err(RepoError::Offline)

src-tauri/src/repository/online.rs

@@ -450,7 +450,7 @@ impl OnlineRepository {
     /// `/universal` endpoint (no `.m3u8` in the path) fails its progressive
     /// loader with `ERROR_CODE_PARSING_CONTAINER_UNSUPPORTED`. mp3 is universally
     /// decodable and supports mid-stream `StartTimeTicks`.
-    pub async fn get_audio_only_stream_url_for_video(
+    pub async fn build_audio_only_stream_url_for_video(
         &self,
         item_id: &str,
         media_source_id: Option<&str>,
@@ -1355,6 +1355,22 @@ impl MediaRepository for OnlineRepository {
         Ok(url)
     }
 
+    async fn get_audio_only_stream_url_for_video(
+        &self,
+        item_id: &str,
+        media_source_id: Option<&str>,
+        start_time_seconds: Option<f64>,
+        audio_stream_index: Option<i32>,
+    ) -> Result<String, RepoError> {
+        self.build_audio_only_stream_url_for_video(
+            item_id,
+            media_source_id,
+            start_time_seconds,
+            audio_stream_index,
+        )
+        .await
+    }
+
     async fn get_live_tv_channels(&self) -> Result<Vec<MediaItem>, RepoError> {
         // Live TV channels (broadcast tuners / IPTV M3U). Returned as items with
         // type "TvChannel" — playable via open_live_stream.