[fix](trx-frontend-http): filter SSE channel events by rig and fix audio hang

Channel SSE events were broadcast to all tabs regardless of rig, causing tabs to display wrong rig's channels. Per-rig audio info_rx override caused WebSocket to hang waiting for stream info that never arrives.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/src/api.rs

@@ -473,13 +473,24 @@ pub async fn events(
     });
 
     // Channel-list change events from the virtual channel manager.
+    // Only forward events for this SSE session's rig so tabs viewing
+    // different rigs don't see each other's channel lists.
     let vchan_change_rx = vchan_mgr.change_tx.subscribe();
-    let chan_updates = futures_util::stream::unfold(vchan_change_rx, |mut rx| async move {
+    let session_rig_for_chan = active_rig_id.clone();
+    let chan_updates = futures_util::stream::unfold(
+        (vchan_change_rx, session_rig_for_chan),
+        |(mut rx, srig)| async move {
             loop {
                 match rx.recv().await {
                     Ok(msg) => {
                         if let Some(colon) = msg.find(':') {
                             let rig_id = &msg[..colon];
+                            // Skip channel events that belong to a different rig.
+                            if let Some(ref expected) = srig {
+                                if rig_id != expected.as_str() {
+                                    continue;
+                                }
+                            }
                             let channels_json = &msg[colon + 1..];
                             let payload =
                                 format!("{{\"rig_id\":\"{rig_id}\",\"channels\":{channels_json}}}");
@@ -487,7 +498,7 @@ pub async fn events(
                                 Ok::<Bytes, Error>(Bytes::from(format!(
                                     "event: channels\ndata: {payload}\n\n"
                                 ))),
-                            rx,
+                                (rx, srig),
                             ));
                         }
                     }
@@ -495,7 +506,8 @@ pub async fn events(
                     Err(broadcast::error::RecvError::Closed) => return None,
                 }
             }
-    });
+        },
+    );
 
     // Send a named "ping" event so the JS heartbeat can observe it.
     let pings = IntervalStream::new(time::interval(Duration::from_secs(5)))

src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs

@@ -537,13 +537,6 @@ pub async fn audio_ws(
     };
     let mut rx_sub = rx_sub;
 
-    // Use per-rig audio info if available and rig_id was specified.
-    if let Some(ref rig_id) = query.rig_id {
-        if let Some(rig_info_rx) = context.rig_audio_info_rx(rig_id) {
-            info_rx = rig_info_rx;
-        }
-    }
-
     let (response, mut session, mut msg_stream) = actix_ws::handle(&req, body)?;
 
     actix_web::rt::spawn(async move {