feat: add active state to automation and effects toggle buttons

- Added showEffects prop to TrackControls interface
- Effects button (E) now shows active state with primary color when toggled
- Automation button (A) already had active state functionality
- Both buttons now provide clear visual feedback when active
- Updated Track component to pass showEffects state to TrackControls

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

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

components/tracks/Track.tsx

@@ -656,6 +656,7 @@ export function Track({
                 isSolo={track.solo}
                 isRecordEnabled={track.recordEnabled}
                 showAutomation={track.automation?.showAutomation}
+                showEffects={track.showEffects}
                 isRecording={isRecording}
                 onVolumeChange={onVolumeChange}
                 onPanChange={onPanChange}

components/tracks/TrackControls.tsx

@@ -15,6 +15,7 @@ export interface TrackControlsProps {
   isSolo?: boolean;
   isRecordEnabled?: boolean;
   showAutomation?: boolean;
+  showEffects?: boolean;
   isRecording?: boolean;
   onVolumeChange: (volume: number) => void;
   onPanChange: (pan: number) => void;
@@ -39,6 +40,7 @@ export function TrackControls({
   isSolo = false,
   isRecordEnabled = false,
   showAutomation = false,
+  showEffects = false,
   isRecording = false,
   onVolumeChange,
   onPanChange,
@@ -155,8 +157,13 @@ export function TrackControls({
         {onEffectsClick && (
           <button
             onClick={onEffectsClick}
-            className="h-5 w-5 rounded flex items-center justify-center transition-all text-[9px] font-bold bg-card hover:bg-accent text-muted-foreground border border-border/50"
-            title="Show effects"
+            className={cn(
+              'h-5 w-5 rounded flex items-center justify-center transition-all text-[9px] font-bold',
+              showEffects
+                ? 'bg-primary text-primary-foreground shadow-md shadow-primary/30'
+                : 'bg-card hover:bg-accent text-muted-foreground border border-border/50'
+            )}
+            title={showEffects ? 'Hide effects' : 'Show effects'}
           >
             E
           </button>