fix(timeline-editor): enable mouse wheel on all sequence viewer elements

Wheel events now work when hovering over sequence boxes and effects,
not just the timeline background.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/timeline_editor/index.html b/tools/timeline_editor/index.html
index 4131782..4efbcd8 100644
--- a/tools/timeline_editor/index.html
+++ b/tools/timeline_editor/index.html
@@ -485,6 +485,7 @@
                 seqDiv.addEventListener('mousedown', e => startDrag(e, 'sequence', seqIndex));
                 seqDiv.addEventListener('click', e => { e.stopPropagation(); selectItem('sequence', seqIndex); });
                 seqDiv.addEventListener('dblclick', e => { e.stopPropagation(); e.preventDefault(); seq._collapsed = !seq._collapsed; renderTimeline(); });
+                seqDiv.addEventListener('wheel', e => viewportController.handleWheel(e), { passive: false });
                 dom.timeline.appendChild(seqDiv);
                 if (!seq._collapsed) {
                     const conflicts = detectConflicts(seq);
@@ -515,6 +516,7 @@
                             if (!e.target.classList.contains('effect-handle')) { e.stopPropagation(); startDrag(e, 'effect', seqIndex, effectIndex); }
                         });
                         effectDiv.addEventListener('click', e => { e.stopPropagation(); selectItem('effect', seqIndex, effectIndex); });
+                        effectDiv.addEventListener('wheel', e => viewportController.handleWheel(e), { passive: false });
                         dom.timeline.appendChild(effectDiv);
                     });
                 }