feat: streamline track and master controls layout consistency

- Streamlined track controls and master controls to same width (240px)
- Fixed track controls container to use full width of parent column
- Matched TrackControls card structure with MasterControls (gap-3, no w-full/h-full)
- Updated outer container padding from p-2 to p-4 with gap-4
- Adjusted track controls wrapper to center content instead of stretching
- Added max-width constraint to PlaybackControls to prevent width changes
- Centered transport control buttons in footer

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

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

types/track.ts

@@ -35,6 +35,7 @@ export interface Track {
   selected: boolean;
   showEffects: boolean; // Show/hide per-track effects panel
   effectsExpanded?: boolean; // Whether effects bar is expanded (when showEffects is true)
+  automationExpanded?: boolean; // Whether automation bar is expanded (shows full controls)
 
   // Selection (for editing operations)
   selection: Selection | null;
@@ -69,7 +70,7 @@ export const TRACK_COLORS: Record<TrackColor, string> = {
   gray: 'rgb(156, 163, 175)',
 };
 
-export const DEFAULT_TRACK_HEIGHT = 360; // Knob + fader with labels + R/S/M/A/E buttons
-export const MIN_TRACK_HEIGHT = 360; // Minimum to fit knob + fader with labels + all buttons
+export const DEFAULT_TRACK_HEIGHT = 400; // Knob + fader with labels + R/S/M/A/E buttons
+export const MIN_TRACK_HEIGHT = 400; // Minimum to fit knob + fader with labels + all buttons
 export const MAX_TRACK_HEIGHT = 500; // Increased for better waveform viewing
 export const COLLAPSED_TRACK_HEIGHT = 48; // Extracted constant for collapsed state