Changed waveforms container from overflow-y-auto to overflow-y-scroll to ensure the vertical scrollbar is always visible. This maintains consistent width alignment between the timeline and waveform areas, preventing playhead marker misalignment that occurred when scrollbar appeared/disappeared based on track count. Fixes the issue where timeline was slightly wider than waveforms when vertical scrollbar was present, causing ~15px offset in playhead position. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>