[fix](trx-frontend-http): instant spectrum overlay on freq/bw changes

Call drawSignalOverlay() synchronously on frequency and bandwidth changes instead of deferring entirely to requestAnimationFrame. Also make bookmark apply fire-and-forget so the click handler returns immediately after optimistic UI updates.

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

@@ -1694,6 +1694,10 @@ function applyLocalTunedFrequency(hz, forceDisplay = false) {
     window.refreshCwTonePicker();
   }
   if (lastSpectrumData) {
+    // Redraw the signal/BW overlay immediately so the frequency marker and
+    // bandwidth picker move without waiting for the next spectrum frame or
+    // requestAnimationFrame callback.
+    drawSignalOverlay();
     scheduleSpectrumDraw();
   }
   positionRdsPsOverlay();
@@ -3784,6 +3788,10 @@ async function applyBwDefaultForMode(mode, sendToServer) {
   currentBandwidthHz = def;
   window.currentBandwidthHz = currentBandwidthHz;
   syncBandwidthInput(def);
+  if (lastSpectrumData) {
+    drawSignalOverlay();
+    scheduleSpectrumDraw();
+  }
   if (sendToServer) {
     try { await postPath(`/set_bandwidth?hz=${def}`); } catch (_) {}
   }
@@ -3802,7 +3810,10 @@ async function applyBandwidthFromInput() {
   currentBandwidthHz = clamped;
   window.currentBandwidthHz = currentBandwidthHz;
   syncBandwidthInput(clamped);
-  if (lastSpectrumData) scheduleSpectrumDraw();
+  if (lastSpectrumData) {
+    drawSignalOverlay();
+    scheduleSpectrumDraw();
+  }
   try {
     if (typeof vchanInterceptBandwidth === "function" && await vchanInterceptBandwidth(clamped)) return;
     await postPath(`/set_bandwidth?hz=${clamped}`);
@@ -3877,7 +3888,10 @@ async function applyAutoBandwidth() {
   currentBandwidthHz = estimated;
   window.currentBandwidthHz = currentBandwidthHz;
   syncBandwidthInput(estimated);
-  if (lastSpectrumData) scheduleSpectrumDraw();
+  if (lastSpectrumData) {
+    drawSignalOverlay();
+    scheduleSpectrumDraw();
+  }
   try {
     if (typeof vchanInterceptBandwidth === "function" && await vchanInterceptBandwidth(estimated)) return;
     await postPath(`/set_bandwidth?hz=${estimated}`);
@@ -9711,6 +9725,7 @@ if (spectrumCanvas || overviewCanvas) {
       currentBandwidthHz = newBw;
       window.currentBandwidthHz = currentBandwidthHz;
       syncBandwidthInput(newBw);
+      drawSignalOverlay();
       scheduleSpectrumDraw();
       scheduleOverviewDraw();
       return;

src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/bookmarks.js

@@ -344,7 +344,9 @@ async function bmApply(bm) {
       scheduleSpectrumDraw();
     }
 
-    // --- Send mode, bandwidth, and frequency to server in parallel ---
+    // --- Fire-and-forget: send mode, bandwidth, and frequency in parallel ---
+    // The UI is already updated optimistically above; don't block on the
+    // network round-trips so the bookmark click feels instant.
     const modePromise = (async () => {
       const onVirtual = typeof vchanInterceptMode === "function"
         && await vchanInterceptMode(bm.mode);
@@ -370,10 +372,8 @@ async function bmApply(bm) {
         await postPath("/set_freq?hz=" + bm.freq_hz);
       }
     })();
-    await Promise.all([modePromise, bwPromise, freqPromise]);
-
-    // --- Toggle decoders when in DIG mode ---
-    if (bm.mode === "DIG" && Array.isArray(bm.decoders)) {
+    // Decoder toggles (DIG mode) — also fire-and-forget.
+    const decoderPromise = (bm.mode === "DIG" && Array.isArray(bm.decoders)) ? (async () => {
       const statusResp = await fetch("/status");
       if (statusResp.ok) {
         const st = await statusResp.json();
@@ -386,7 +386,12 @@ async function bmApply(bm) {
         check("ft8"); check("ft4"); check("ft2"); check("wspr"); check("hf-aprs");
         if (toggles.length) await Promise.all(toggles);
       }
-    }
+    })() : Promise.resolve();
+    // Don't await — let the network calls settle in the background.
+    // Errors are logged but don't block the UI.
+    Promise.all([modePromise, bwPromise, freqPromise, decoderPromise]).catch(
+      (err) => console.error("Bookmark apply background error:", err)
+    );
   } catch (err) {
     console.error("Failed to apply bookmark:", err);
   }