fix: revert track heights and increase control card bottom padding

Reverted track heights to original values:
- DEFAULT_TRACK_HEIGHT: 360px → 340px
- MIN_TRACK_HEIGHT: 260px → 240px

Increased bottom padding of TrackControls from py-2 to pt-2 pb-4
for better spacing at the bottom of the control card.

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

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

components/tracks/TrackControls.tsx

@@ -57,7 +57,7 @@ export function TrackControls({
 }: TrackControlsProps) {
   return (
     <div className={cn(
-      'flex flex-col items-center justify-between h-full px-3 py-2 bg-card/50 border-2 border-accent/50 rounded-lg',
+      'flex flex-col items-center justify-between h-full px-3 pt-2 pb-4 bg-card/50 border-2 border-accent/50 rounded-lg',
       className
     )}>
       {/* Pan Control - Top */}

types/track.ts

@@ -68,7 +68,7 @@ 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 = 260; // Minimum to fit knob + fader with labels + all buttons
+export const DEFAULT_TRACK_HEIGHT = 340; // Knob + fader with labels + R/S/M/A/E buttons
+export const MIN_TRACK_HEIGHT = 240; // 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