[fix](trx-frontend-http): restore select_rig call and simplify play button icon

Rig switch needs the server call so SSE/audio follow the selected rig. Play button now uses a fixed triangle icon sized to match header controls.

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/assets/web/app.js

@@ -3349,9 +3349,6 @@ async function switchRigFromSelect(selectEl) {
     showHint("Unknown rig", 1500);
     return;
   }
-  // Rig selection is purely client-side: set the per-tab rig_id so all
-  // subsequent commands target this rig.  No server call needed — postPath()
-  // auto-appends rig_id to every request.
   const prevRig = lastActiveRigId;
   lastActiveRigId = selectEl.value;
   if (prevRig && prevRig !== lastActiveRigId) {
@@ -3360,6 +3357,14 @@ async function switchRigFromSelect(selectEl) {
   updateRigSubtitle(lastActiveRigId);
   if (typeof setSchedulerRig === "function") setSchedulerRig(lastActiveRigId);
   if (typeof setBackgroundDecodeRig === "function") setBackgroundDecodeRig(lastActiveRigId);
+  // Also switch the server's active rig so the SSE stream and audio
+  // follow.  Commands already carry rig_id per-tab, but SSE is still
+  // global until per-session streams are implemented.
+  try {
+    await postPath(`/select_rig?rig_id=${encodeURIComponent(selectEl.value)}`);
+  } catch (err) {
+    console.error("select_rig failed:", err);
+  }
   showHint(`Rig: ${lastActiveRigId}`, 1500);
 }
 
@@ -7748,15 +7753,9 @@ txAudioBtn.addEventListener("click", startTxAudio);
 
 // Header play button mirrors the RX audio toggle.
 const headerAudioToggle = document.getElementById("header-audio-toggle");
-const headerAudioIconPath = document.getElementById("header-audio-icon-path");
-const PLAY_ICON = "M5 3.5v9l7-4.5z";
-const STOP_ICON = "M4 3.5h8v9H4z";
 function syncHeaderAudioBtn() {
   if (!headerAudioToggle) return;
   headerAudioToggle.classList.toggle("audio-active", rxActive);
-  if (headerAudioIconPath) {
-    headerAudioIconPath.setAttribute("d", rxActive ? STOP_ICON : PLAY_ICON);
-  }
   headerAudioToggle.title = rxActive ? "Stop audio" : "Play audio";
 }
 if (headerAudioToggle) {

src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html

@@ -59,7 +59,7 @@
       </div>
       <div class="top-bar-actions">
         <button id="header-audio-toggle" class="header-bar-btn header-audio-btn" aria-label="Toggle audio playback" title="Toggle audio playback">
-          <svg viewBox="0 0 16 16" width="14" height="14" fill="currentColor" aria-hidden="true"><path id="header-audio-icon-path" d="M5 3.5v9l7-4.5z"/></svg>
+          <svg viewBox="0 0 16 16" fill="currentColor" aria-hidden="true"><path d="M5 3v10l8-5z"/></svg>
         </button>
         <div class="header-rig-switch">
           <select id="header-rig-switch-select" aria-label="Select active rig"></select>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css

@@ -1041,6 +1041,10 @@ small { color: var(--text-muted); }
   cursor: pointer;
   flex-shrink: 0;
 }
+.header-audio-btn svg {
+  width: 1rem;
+  height: 1rem;
+}
 .header-audio-btn.audio-active {
   color: var(--accent-green);
   border-color: var(--accent-green);