[fix](trx-frontend-http): scope channel audio by remote

Send the selected remote together with virtual-channel audio requests and use per-rig stream info when /audio is opened with channel_id.

This keeps browser channel audio aligned with the requested remote after the recent multi-rig client changes.

Add coverage for parsing channel_id together with remote.

Co-authored-by: OpenAI Codex <noreply@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js

@@ -7672,7 +7672,10 @@ function startRxAudio() {
   const proto = location.protocol === "https:" ? "wss:" : "ws:";
   let audioPath;
   if (_audioChannelOverride) {
-    audioPath = `/audio?channel_id=${encodeURIComponent(_audioChannelOverride)}`;
+    const remoteParam = lastActiveRigId
+      ? `&remote=${encodeURIComponent(lastActiveRigId)}`
+      : "";
+    audioPath = `/audio?channel_id=${encodeURIComponent(_audioChannelOverride)}${remoteParam}`;
   } else if (lastActiveRigId) {
     audioPath = `/audio?remote=${encodeURIComponent(lastActiveRigId)}`;
   } else {

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

@@ -502,7 +502,14 @@ pub async fn audio_ws(
         broadcast::Receiver<Bytes>,
         tokio::sync::watch::Receiver<Option<trx_core::audio::AudioStreamInfo>>,
     ) = if let Some(ch_id) = query.channel_id {
-        let Some(info_rx) = context.audio_info.as_ref().cloned() else {
+        let info_rx = if let Some(ref remote) = query.remote {
+            context
+                .rig_audio_info_rx(remote)
+                .or_else(|| context.audio_info.as_ref().cloned())
+        } else {
+            context.audio_info.as_ref().cloned()
+        };
+        let Some(info_rx) = info_rx else {
             return Ok(HttpResponse::NotFound().body("audio not enabled"));
         };
         let deadline = Instant::now() + Duration::from_secs(2);
@@ -636,6 +643,7 @@ pub async fn audio_ws(
 #[cfg(test)]
 mod tests {
     use super::AudioQuery;
+    use uuid::Uuid;
 
     #[test]
     fn audio_query_accepts_remote() {
@@ -643,4 +651,15 @@ mod tests {
             serde_json::from_str(r#"{"remote":"lidzbark-vhf"}"#).expect("query parse");
         assert_eq!(query.remote.as_deref(), Some("lidzbark-vhf"));
     }
+
+    #[test]
+    fn audio_query_accepts_channel_id_with_remote() {
+        let channel_id = Uuid::new_v4();
+        let query: AudioQuery = serde_json::from_str(&format!(
+            r#"{{"channel_id":"{channel_id}","remote":"lidzbark-vhf"}}"#
+        ))
+        .expect("query parse");
+        assert_eq!(query.channel_id, Some(channel_id));
+        assert_eq!(query.remote.as_deref(), Some("lidzbark-vhf"));
+    }
 }