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}