fix(timeline-editor): capture all wheel events at container level

- Add timelineContainer reference and capture wheel events with { capture: true }
- Remove redundant wheel handlers from individual sequence/effect elements
- Prevents child elements from interfering with zoom/scroll functionality

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

1 files changed, 3 insertions, 5 deletions

diff --git a/tools/timeline_editor/timeline-viewport.js b/tools/timeline_editor/timeline-viewport.js
index 196368e..c0e3cf5 100644
--- a/tools/timeline_editor/timeline-viewport.js
+++ b/tools/timeline_editor/timeline-viewport.js
@@ -22,17 +22,15 @@ export class ViewportController {
         // Scroll sync
         this.dom.timelineContent.addEventListener('scroll', () => this.handleScroll());
 
-        // Wheel handling
+        // Wheel handling - capture at container level to override all child elements
         const wheelHandler = e => this.handleWheel(e);
-        this.dom.timelineContent.addEventListener('wheel', wheelHandler, { passive: false });
-        this.dom.waveformContainer.addEventListener('wheel', wheelHandler, { passive: false });
+        this.dom.timelineContainer.addEventListener('wheel', wheelHandler, { passive: false, capture: true });
 
-        // Prevent wheel bubbling from UI containers
+        // Prevent wheel bubbling from UI containers outside timeline
         document.querySelector('header').addEventListener('wheel', e => e.stopPropagation());
         this.dom.propertiesPanel.addEventListener('wheel', e => e.stopPropagation());
         document.querySelector('.zoom-controls').addEventListener('wheel', e => e.stopPropagation());
         document.querySelector('.stats').addEventListener('wheel', e => e.stopPropagation());
-        document.getElementById('timeMarkers').addEventListener('wheel', e => e.stopPropagation());
 
         // Waveform hover tracking
         this.dom.waveformContainer.addEventListener('mouseenter', () => this.showWaveformCursor());