fix(mq_editor): destroy old viewer listeners on WAV reload

Each loadAudioBuffer() was creating a new SpectrogramViewer without
removing the previous one's canvas event listeners. Old viewers would
fire on every mouse event, rendering stale spectrogram data and calling
editor.onPartialSelect() with out-of-range indices (hiding the amp panel).

Fix: store handlers as named instance properties, add destroy() to remove
them, and call destroy() before creating a new viewer.

handoff(Claude): bug fix only, no behaviour change
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions