feat(mq_editor): f·Power checkbox, deselect on extract, panel refresh after auto-spread

- Add 'f·Power' checkbox: weights spectrum by f before peak detection (f·FFT_Power(f))
  to accentuate high-frequency peaks; re-runs extraction on toggle
- Deselect partial after Extract Partials run
- Fix right panel not refreshing after Auto Spread All: re-call editor.onPartialSelect

handoff(Claude): mq_editor UX polish

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

3 files changed, 22 insertions, 8 deletions

diff --git a/tools/mq_editor/README.md b/tools/mq_editor/README.md
index 141963a..0ef2e72 100644
--- a/tools/mq_editor/README.md
+++ b/tools/mq_editor/README.md
@@ -27,6 +27,7 @@ open tools/mq_editor/index.html
 
 - **Hop Size:** 64–1024 samples (default 256)
 - **Threshold:** dB floor for peak detection (default −60 dB)
+- **f·Power:** checkbox — weight spectrum by frequency (`f·FFT_Power(f)`) before peak detection, accentuating high-frequency peaks
 - **Keep %:** slider to limit how many partials are shown/synthesized
 
 ## Keyboard Shortcuts
@@ -67,7 +68,7 @@ open tools/mq_editor/index.html
 ## Algorithm
 
 1. **STFT:** Overlapping Hann windows, radix-2 FFT
-2. **Peak Detection:** Local maxima above threshold + parabolic interpolation
+2. **Peak Detection:** Local maxima above threshold + parabolic interpolation; optional `f·Power(f)` frequency weighting to accentuate high-frequency peaks
 3. **Forward Tracking:** Birth/death/continuation with frequency-dependent tolerance, candidate persistence
 4. **Backward Expansion:** Second pass extends each partial leftward to recover onset frames
 5. **Bezier Fitting:** Cubic curves with control points at t/3 and 2t/3
diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index f6d052b..aab603b 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -261,6 +261,10 @@
       <label>Threshold (dB):</label>
       <input type="number" id="threshold" value="-20" step="any">
 
+      <label style="margin-left:16px;" title="Weight spectrum by frequency before peak detection (f * FFT_Power(f)), accentuates high-frequency peaks">
+        <input type="checkbox" id="freqWeight"> f·Power
+      </label>
+
       <label style="margin-left:16px;">Keep:</label>
       <input type="range" id="keepPct" min="1" max="100" value="100" style="width:100px; vertical-align:middle;">
       <span id="keepPctLabel" style="margin-left:4px;">100%</span>
@@ -366,6 +370,7 @@
 
     const hopSize = document.getElementById('hopSize');
     const threshold = document.getElementById('threshold');
+    const freqWeightCb = document.getElementById('freqWeight');
     const keepPct = document.getElementById('keepPct');
     const keepPctLabel = document.getElementById('keepPctLabel');
     const fftSize = 1024; // Fixed
@@ -483,6 +488,7 @@
             fftSize: fftSize,
             hopSize: parseInt(hopSize.value),
             threshold: parseFloat(threshold.value),
+            freqWeight: freqWeightCb.checked,
             sampleRate: audioBuffer.sampleRate
           };
 
@@ -501,9 +507,7 @@
           setStatus(`Extracted ${result.partials.length} partials`, 'info');
           viewer.setPartials(result.partials);
           viewer.setKeepCount(getKeepCount());
-          // Refresh panels: re-select if index still valid, else clear
-          const prevSel = viewer.selectedPartial;
-          viewer.selectPartial(prevSel >= 0 && prevSel < result.partials.length ? prevSel : -1);
+          viewer.selectPartial(-1);
 
         } catch (err) {
           setStatus('Extraction error: ' + err.message, 'error');
@@ -531,6 +535,8 @@
         p.replicas.spread_below = spread_below;
       }
       if (viewer) viewer.render();
+      const sel = viewer ? viewer.selectedPartial : -1;
+      if (sel >= 0) editor.onPartialSelect(sel);
       setStatus(`Auto-spread applied to ${extractedPartials.length} partials`, 'info');
     });
 
@@ -538,6 +544,10 @@
       if (stftCache) runExtraction();
     });
 
+    freqWeightCb.addEventListener('change', () => {
+      if (stftCache) runExtraction();
+    });
+
     function playAudioBuffer(buffer, statusMsg) {
       const startTime = audioContext.currentTime;
       currentSource = audioContext.createBufferSource();
diff --git a/tools/mq_editor/mq_extract.js b/tools/mq_editor/mq_extract.js
index d29cfbc..c03e869 100644
--- a/tools/mq_editor/mq_extract.js
+++ b/tools/mq_editor/mq_extract.js
@@ -3,14 +3,14 @@
 
 // Extract partials from audio buffer
 function extractPartials(params, stftCache) {
-  const {fftSize, threshold, sampleRate} = params;
+  const {fftSize, threshold, sampleRate, freqWeight} = params;
   const numFrames = stftCache.getNumFrames();
 
   const frames = [];
   for (let i = 0; i < numFrames; ++i) {
     const cachedFrame = stftCache.getFrameAtIndex(i);
     const squaredAmp = stftCache.getSquaredAmplitude(cachedFrame.time);
-    const peaks = detectPeaks(squaredAmp, fftSize, sampleRate, threshold);
+    const peaks = detectPeaks(squaredAmp, fftSize, sampleRate, threshold, freqWeight);
     frames.push({time: cachedFrame.time, peaks});
   }
 
@@ -29,10 +29,13 @@ function extractPartials(params, stftCache) {
 
 // Detect spectral peaks via local maxima + parabolic interpolation
 // squaredAmp: pre-computed re*re+im*im per bin
-function detectPeaks(squaredAmp, fftSize, sampleRate, thresholdDB) {
+// freqWeight: if true, weight by f before peak detection (f * Power(f))
+function detectPeaks(squaredAmp, fftSize, sampleRate, thresholdDB, freqWeight) {
   const mag = new Float32Array(fftSize / 2);
+  const binHz = sampleRate / fftSize;
   for (let i = 0; i < fftSize / 2; ++i) {
-    mag[i] = 10 * Math.log10(Math.max(squaredAmp[i], 1e-20));
+    const w = freqWeight ? (i * binHz) : 1.0;
+    mag[i] = 10 * Math.log10(Math.max(squaredAmp[i] * w, 1e-20));
   }
 
   const peaks = [];