[fix](trx-backend-soapysdr,trx-frontend-http): make wfm mono mode real

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

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

@@ -1252,6 +1252,13 @@ function render(update) {
     if (wfmDeemphasisEl && typeof update.filter.wfm_deemphasis_us === "number") {
       wfmDeemphasisEl.value = String(update.filter.wfm_deemphasis_us);
     }
+    if (wfmAudioModeEl && typeof update.filter.wfm_stereo === "boolean") {
+      const nextMode = update.filter.wfm_stereo ? "stereo" : "mono";
+      if (wfmAudioModeEl.value !== nextMode) {
+        wfmAudioModeEl.value = nextMode;
+        saveSetting("wfmAudioMode", nextMode);
+      }
+    }
     if (wfmDenoiseBtn && typeof update.filter.wfm_denoise === "boolean") {
       const on = update.filter.wfm_denoise;
       wfmDenoiseBtn.textContent = on ? "On" : "Off";
@@ -2587,6 +2594,8 @@ if (wfmAudioModeEl) {
   wfmAudioModeEl.value = loadSetting("wfmAudioMode", "stereo");
   wfmAudioModeEl.addEventListener("change", () => {
     saveSetting("wfmAudioMode", wfmAudioModeEl.value);
+    const enabled = wfmAudioModeEl.value !== "mono";
+    postPath(`/set_wfm_stereo?enabled=${enabled ? "true" : "false"}`).catch(() => {});
   });
 }
 if (wfmDeemphasisEl) {

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

@@ -486,6 +486,19 @@ pub async fn set_wfm_deemphasis(
     send_command(&rig_tx, RigCommand::SetWfmDeemphasis(query.us)).await
 }
 
+#[derive(serde::Deserialize)]
+pub struct WfmStereoQuery {
+    pub enabled: bool,
+}
+
+#[post("/set_wfm_stereo")]
+pub async fn set_wfm_stereo(
+    query: web::Query<WfmStereoQuery>,
+    rig_tx: web::Data<mpsc::Sender<RigRequest>>,
+) -> Result<HttpResponse, Error> {
+    send_command(&rig_tx, RigCommand::SetWfmStereo(query.enabled)).await
+}
+
 #[post("/toggle_wfm_denoise")]
 pub async fn toggle_wfm_denoise(
     state: web::Data<watch::Receiver<RigState>>,
@@ -713,6 +726,7 @@ pub fn configure(cfg: &mut web::ServiceConfig) {
         .service(set_bandwidth)
         .service(set_fir_taps)
         .service(set_wfm_deemphasis)
+        .service(set_wfm_stereo)
         .service(toggle_wfm_denoise)
         .service(toggle_aprs_decode)
         .service(toggle_cw_decode)