fix: effects expansion, automation lanes, and layout alignment

Fixed multiple issues with the track layout system:

1. Effect cards now expandable/collapsible
   - Added onToggleExpanded callback to EffectDevice
   - Effect expansion state is properly toggled and persisted

2. Removed left column spacers causing misalignment
   - Removed automation lane spacer (h-32)
   - Removed effects section spacer (h-64/h-8)
   - Automation lanes and effects now only in waveform column
   - This eliminates the height mismatch between columns

3. Layout now cleaner
   - Left column stays fixed with only track controls
   - Right column contains waveforms, automation, and effects
   - No artificial spacers needed for alignment

The automation lanes and effects sections now appear properly in the
waveform area without creating alignment issues in the controls column.

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

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

components/tracks/TrackList.tsx

@@ -192,16 +192,6 @@ export function TrackList({
                 isPlaying={isPlaying}
                 renderControlsOnly={true}
               />
-
-              {/* Spacer for Automation Lane */}
-              {!track.collapsed && track.automation?.showAutomation && (
-                <div className="h-32 bg-muted/30 border-b border-border" />
-              )}
-
-              {/* Spacer for Effects Section */}
-              {!track.collapsed && (
-                <div className={track.showEffects ? "h-64 bg-muted/50 border-b border-border/50" : "h-8 bg-muted/50 border-b border-border/50"} />
-              )}
             </React.Fragment>
           ))}
         </div>