refactor(mq_editor): consolidate duplicates, extract utils.js and app.js

- utils.js (new): evalBezier (robust), getCanvasCoords, buildBandPoints
- app.js (new): extract ~450-line inline script from index.html
- editor.js: generalize _makeJogSlider(inp, options) with onUpdate cb,
  eliminate 50-line inline resonator jog duplication, use getCanvasCoords
- mq_extract.js: extract findBestPeak(), replace two identical loop bodies
- viewer.js: remove duplicate evalBezier, use getCanvasCoords/buildBandPoints
- mq_synth.js: remove duplicate evalBezier
- index.html: inline script removed, load order: utils→fft→extract→synth→viewer→editor→app

handoff(Claude): mq_editor refactor complete — no logic changes, browser-ready.

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

1 files changed, 17 insertions, 24 deletions

diff --git a/tools/mq_editor/mq_extract.js b/tools/mq_editor/mq_extract.js
index 3f7490d..107b2ac 100644
--- a/tools/mq_editor/mq_extract.js
+++ b/tools/mq_editor/mq_extract.js
@@ -102,6 +102,21 @@ function normalizeAngle(angle) {
   return angle - 2 * Math.PI * Math.floor((angle + Math.PI) / (2 * Math.PI));
 }
 
+// Find best matching peak for a predicted freq/phase. Returns {bestIdx, bestCost}.
+function findBestPeak(peaks, matched, predictedFreq, predictedPhase, tol, phaseErrorWeight) {
+  let bestIdx = -1, bestCost = Infinity;
+  for (let i = 0; i < peaks.length; ++i) {
+    if (matched.has(i)) continue;
+    const pk = peaks[i];
+    const freqError = Math.abs(pk.freq - predictedFreq);
+    if (freqError > tol) continue;
+    const phaseError = Math.abs(normalizeAngle(pk.phase - predictedPhase));
+    const cost = freqError + phaseErrorWeight * phaseError * predictedFreq;
+    if (cost < bestCost) { bestCost = cost; bestIdx = i; }
+  }
+  return { bestIdx, bestCost };
+}
+
 // Track partials across frames using phase coherence for robust matching.
 function trackPartials(frames, params) {
   const {
@@ -134,19 +149,8 @@ function trackPartials(frames, params) {
       const predictedPhase = lastPhase + phaseAdvance;
       
       const tol = Math.max(predictedFreq * trackingRatio, minTrackingHz);
-      let bestIdx = -1, bestCost = Infinity;
-
       // Find the peak in the new frame with the lowest cost (freq + phase error).
-      for (let i = 0; i < frame.peaks.length; ++i) {
-        if (matched.has(i)) continue;
-        const pk = frame.peaks[i];
-        const freqError = Math.abs(pk.freq - predictedFreq);
-        if (freqError > tol) continue;
-
-        const phaseError = Math.abs(normalizeAngle(pk.phase - predictedPhase));
-        const cost = freqError + phaseErrorWeight * phaseError * predictedFreq;
-        if (cost < bestCost) { bestCost = cost; bestIdx = i; }
-      }
+      const { bestIdx } = findBestPeak(frame.peaks, matched, predictedFreq, predictedPhase, tol, phaseErrorWeight);
 
       if (bestIdx >= 0) {
         const pk = frame.peaks[bestIdx];
@@ -175,18 +179,7 @@ function trackPartials(frames, params) {
       const predictedPhase = lastPhase + phaseAdvance;
 
       const tol = Math.max(predictedFreq * trackingRatio, minTrackingHz);
-      let bestIdx = -1, bestCost = Infinity;
-
-      for (let j = 0; j < frame.peaks.length; ++j) {
-        if (matched.has(j)) continue;
-        const pk = frame.peaks[j];
-        const freqError = Math.abs(pk.freq - predictedFreq);
-        if (freqError > tol) continue;
-        
-        const phaseError = Math.abs(normalizeAngle(pk.phase - predictedPhase));
-        const cost = freqError + phaseErrorWeight * phaseError * predictedFreq;
-        if (cost < bestCost) { bestCost = cost; bestIdx = j; }
-      }
+      const { bestIdx } = findBestPeak(frame.peaks, matched, predictedFreq, predictedPhase, tol, phaseErrorWeight);
 
       if (bestIdx >= 0) {
         const pk = frame.peaks[bestIdx];