fix(mq_editor): enable explore mode immediately on WAV load

Pre-compute peak frames after STFT cache is built, so trackFromSeed
works without requiring Extract Partials first.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/tools/mq_editor/app.js b/tools/mq_editor/app.js
index 41df49a..62c1bb7 100644
--- a/tools/mq_editor/app.js
+++ b/tools/mq_editor/app.js
@@ -155,7 +155,22 @@ function loadAudioBuffer(buffer, label) {
     const signal = audioBuffer.getChannelData(0);
     stftCache = new STFTCache(signal, audioBuffer.sampleRate, fftSize, Math.max(64, parseInt(hopSize.value) || 64));
     setStatus(`${label} — ${audioBuffer.duration.toFixed(2)}s, ${audioBuffer.sampleRate}Hz, ${audioBuffer.numberOfChannels}ch (${stftCache.getNumFrames()} frames cached)`, 'info');
+
+    // Pre-compute peak frames so explore mode works immediately (before Extract)
+    const peakFrames = [];
+    for (let i = 0; i < stftCache.getNumFrames(); ++i) {
+      const f = stftCache.getFrameAtIndex(i);
+      peakFrames.push({
+        time: f.time,
+        peaks: detectPeaks(f.squaredAmplitude, f.phase, fftSize, audioBuffer.sampleRate,
+                           parseFloat(threshold.value), freqWeightCb.checked,
+                           parseFloat(prominence.value)),
+      });
+    }
+
     viewer = new SpectrogramViewer(canvas, audioBuffer, stftCache);
+    viewer.setFrames(peakFrames);
+    document.getElementById('exploreBtn').disabled = false;
     editor.setViewer(viewer);
     viewer.onPartialSelect = (i) => editor.onPartialSelect(i);
     viewer.onRender        = ()  => editor.onRender();
@@ -284,7 +299,6 @@ function runExtraction() {
     autoSpreadAllBtn.disabled = false;
     document.getElementById('newPartialBtn').disabled = false;
     document.getElementById('clearAllBtn').disabled = false;
-    document.getElementById('exploreBtn').disabled = false;
     undoStack.length = 0; redoStack.length = 0; _updateUndoRedoBtns();
   }, 50);
 }