feat(mq_editor): add iso-contour tracking mode for bass/diffuse regions

trackIsoContour() follows constant energy level through STFT frames
instead of peaks. Useful for broad bass areas where peak detector finds
nothing. Preview in cyan, auto-detects spread on commit (naturally large).

Toggle: ≋ Contour button or C key. Mutually exclusive with ⊕ Explore.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index 9d50044..dea6e50 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -42,6 +42,7 @@
     button:disabled { opacity: 0.5; cursor: not-allowed; }
     #extractBtn { background: #666; color: #fff; font-weight: bold; border-color: #888; }
     button.explore-active { background: #554; border-color: #aa8; color: #ffd; }
+    button.contour-active { background: #145; border-color: #0cc; color: #aff; }
     input[type="file"] { display: none; }
     .params {
       display: flex;
@@ -288,6 +289,7 @@
     <button id="newPartialBtn" disabled>+ Partial</button>
     <button id="clearAllBtn" disabled>✕ Clear All</button>
     <button id="exploreBtn" disabled>⊕ Explore</button>
+    <button id="contourBtn" disabled>≋ Contour</button>
     <button id="undoBtn" disabled>↩ Undo</button>
     <button id="redoBtn" disabled>↪ Redo</button>