fix: remove wrapper div to show automation lane controls properly

- Remove h-32 wrapper div around AutomationLane
- AutomationLane now uses its own height (lane.height, defaults to 80px)
- Automation controls (canvas, points) now visible and interactive

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/tracks/TrackList.tsx

@@ -337,8 +337,8 @@ export function TrackList({
                       {track.automation.lanes
                         .filter((lane) => lane.parameterId === (track.automation.selectedParameterId || 'volume') && lane.visible)
                         .map((lane) => (
-                          <div key={lane.id} className="h-32">
                             <AutomationLane
+                              key={lane.id}
                               lane={lane}
                               zoom={zoom}
                               currentTime={currentTime}
@@ -388,7 +388,6 @@ export function TrackList({
                                 });
                               }}
                             />
-                          </div>
                         ))}
                     </div>
                   )}