Added comprehensive mobile support for Phase 15 (Polish & Optimization): **Mobile Layout Enhancements:** - Track controls now collapsible on mobile with two states: - Collapsed: minimal controls with expand chevron, R/M/S buttons, horizontal level meter - Expanded: full height fader, pan control, all buttons - Track collapse buttons added to mobile view (left chevron for track collapse, right chevron for control collapse) - Master controls collapse button hidden on desktop (lg:hidden) - Automation and effects bars now available on mobile layout - Both bars collapsible with eye/eye-off icons, horizontally scrollable when zoomed - Mobile vertical stacking: controls → waveform → automation → effects per track **Bug Fixes:** - Fixed track controls and waveform container height matching on desktop - Fixed Modal component prop: isOpen → open in all dialog components - Fixed TypeScript null check for audioBuffer.duration - Fixed keyboard shortcut category: 'help' → 'view' **Technical Improvements:** - Consistent height calculation using trackHeight variable - Proper responsive breakpoints with Tailwind (sm:640px, lg:1024px) - Progressive disclosure pattern for mobile controls 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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