feat(qconnect-app): emit PlaybackError app event from renderer failure

Decodes PlaybackErrorMessage off the InboundPayloadBytes batch and emits a
PlaybackError app event; the Tauri event sink forwards it to qconnect:event
via its existing catch-all emit.

cc

crates/Cargo.lock

@@ -5309,6 +5309,7 @@ version = "0.1.0"
 dependencies = [
  "async-trait",
  "log",
+ "prost",
  "qconnect-core",
  "qconnect-protocol",
  "qconnect-transport-ws",

crates/qconnect-app/Cargo.toml

@@ -19,3 +19,4 @@ log = { workspace = true }
 
 [dev-dependencies]
 tokio = { workspace = true, features = ["test-util"] }
+prost = "0.13"

crates/qconnect-app/src/app.rs

@@ -9,8 +9,8 @@ use qconnect_core::{
 };
 use qconnect_protocol::{
     build_qconnect_outbound_envelope, build_qconnect_renderer_outbound_envelope,
-    parse_inbound_event, InboundEnvelope, QueueCommand, QueueCommandType, QueueEventType,
-    QueueServerEvent, RendererCommandType, RendererReport, RendererReportType,
+    decode_playback_error, parse_inbound_event, InboundEnvelope, QueueCommand, QueueCommandType,
+    QueueEventType, QueueServerEvent, RendererCommandType, RendererReport, RendererReportType,
     RendererServerCommand,
 };
 use qconnect_transport_ws::{TransportEvent, WsTransport, WsTransportConfig};
@@ -213,6 +213,20 @@ where
             TransportEvent::InboundRendererServerCommand(command) => {
                 self.apply_renderer_server_command(command).await?;
             }
+            TransportEvent::InboundPayloadBytes { payload, .. } => {
+                // The batch carries renderer per-track failures as a tag-3
+                // playback_error on a messages[] entry. The queue/renderer
+                // decoders ignore it, so decode it here off the raw batch bytes.
+                if let Some(error) = decode_playback_error(&payload) {
+                    self.sink
+                        .on_event(QconnectAppEvent::PlaybackError {
+                            queue_item_id: error.queue_item_id,
+                            error_type: error.error_type,
+                            queue_version: error.queue_version,
+                        })
+                        .await;
+                }
+            }
             TransportEvent::Authenticated
             | TransportEvent::Subscribed
             | TransportEvent::SessionEstablished
@@ -223,7 +237,6 @@ where
             | TransportEvent::TransportError { .. }
             | TransportEvent::CloudError { .. }
             | TransportEvent::InboundFrameDecoded { .. }
-            | TransportEvent::InboundPayloadBytes { .. }
             | TransportEvent::OutboundSent { .. } => {}
         }
         Ok(())
@@ -1252,6 +1265,54 @@ mod tests {
         );
     }
 
+    #[tokio::test]
+    async fn inbound_playback_error_emits_playback_error_app_event() {
+        use prost::Message as _;
+        use qconnect_protocol::{
+            ErrorType, PlaybackErrorMessage, QConnectMessage, QConnectMessages, QueueVersionRef,
+        };
+        use qconnect_transport_ws::TransportEvent;
+
+        let (app, sink, _transport, _events_rx) = build_connected_app().await;
+
+        let batch = QConnectMessages {
+            messages_time: None,
+            messages_id: None,
+            messages: vec![QConnectMessage {
+                message_type: Some(2), // PLAYBACK_ERROR
+                playback_error: Some(PlaybackErrorMessage {
+                    queue_version: Some(QueueVersionRef {
+                        major: Some(4),
+                        minor: Some(2),
+                    }),
+                    queue_item_id: Some(77),
+                    error_type: Some(5), // NETWORK_ERROR
+                }),
+                ..Default::default()
+            }],
+        };
+
+        app.handle_transport_event(TransportEvent::InboundPayloadBytes {
+            cloud_message_type: 0,
+            payload: batch.encode_to_vec(),
+        })
+        .await
+        .expect("handle playback-error frame");
+
+        let events = sink.snapshot().await;
+        assert!(
+            events.iter().any(|event| matches!(
+                event,
+                QconnectAppEvent::PlaybackError {
+                    queue_item_id: 77,
+                    error_type: ErrorType::NetworkError,
+                    ..
+                }
+            )),
+            "expected a PlaybackError app event for queue item 77 / NetworkError"
+        );
+    }
+
     #[tokio::test]
     async fn autoplay_growth_triggers_queue_state_resync() {
         let (app, sink, transport, _events_rx) = build_connected_app().await;

crates/qconnect-app/src/events.rs

@@ -31,6 +31,14 @@ pub enum QconnectAppEvent {
         action_uuid: String,
     },
     QueueResyncTriggered,
+    /// Renderer per-track playback failure (PlaybackErrorMessage). The frontend
+    /// maps streamable/network/not-found failures on the current item to an
+    /// auto-skip; other types surface a toast only.
+    PlaybackError {
+        queue_item_id: u64,
+        error_type: qconnect_protocol::ErrorType,
+        queue_version: Option<qconnect_core::QueueVersion>,
+    },
     /// Session management event from server (types 81-87, 97-101).
     /// These don't affect the queue reducer but provide session topology info.
     SessionManagementEvent {

crates/qconnect-protocol/src/lib.rs

@@ -17,6 +17,11 @@ pub use decoder::decode_queue_server_events;
 pub use decoder::decode_renderer_server_commands;
 pub use error::ProtocolError;
 pub use event::{ErrorType, PlaybackErrorEvent, QueueEventType, QueueServerEvent};
+// Proto message types needed by downstream crates to construct/encode frames
+// (e.g. PlaybackErrorMessage for tests and any future re-encoding path).
+pub use queue_command_proto::{
+    PlaybackErrorMessage, QConnectMessage, QConnectMessages, QueueVersionRef,
+};
 pub use mapper::{
     build_qconnect_outbound_envelope, build_qconnect_renderer_outbound_envelope,
     encode_queue_command_batch, encode_renderer_report_batch,