fix: hide zoom level option in piano roll window's sheet music view

src/components/piano-roll/PianoRollToolbar.test.tsx

@@ -130,10 +130,23 @@ describe('PianoRollToolbar', () => {
     expect(screen.getByRole('button', { name: 'Sheet Music View' })).toBeInTheDocument();
     expect(screen.getByRole('button', { name: /16,48/i })).toBeInTheDocument();
     expect(screen.getByRole('button', { name: 'Show Entire Track' })).toBeInTheDocument();
+    expect(screen.queryByRole('button', { name: '1x' })).not.toBeInTheDocument();
     expect(screen.queryByRole('button', { name: 'Pointer Tool' })).not.toBeInTheDocument();
     expect(screen.queryByRole('button', { name: /Pitch Bend/i })).not.toBeInTheDocument();
   });
 
+  it('shows the zoom button outside sheet mode', () => {
+    render(
+      <PianoRollToolbar
+        {...baseProps}
+        sheetMusicViewEnabled={false}
+        mode="midi-edit"
+      />
+    );
+
+    expect(screen.getByRole('button', { name: '1x' })).toBeInTheDocument();
+  });
+
   it('toggles the full-track sheet scope button', () => {
     const onSheetMusicTrackScopeToggle = vi.fn();
 

src/components/piano-roll/PianoRollToolbar.tsx

@@ -256,6 +256,7 @@ const PianoRollToolbar: React.FC<PianoRollToolbarProps> = ({
           </div>
         )}
 
+        {!sheetMusicViewEnabled && (
           <div className="quant-dropdown-container" ref={zoomSliderRef}>
             <button
               className="quant-button"
@@ -278,6 +279,7 @@ const PianoRollToolbar: React.FC<PianoRollToolbarProps> = ({
               </div>
             )}
           </div>
+        )}
       </div>
     </div>
   );