fix: revert to 1 decimal place for fader labels

Changed back from .toFixed(2) to .toFixed(1) while keeping the fixed
widths to prevent component movement.

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

components/tracks/TrackFader.tsx

@@ -168,7 +168,7 @@ export function TrackFader({
           valueDb > -6 ? 'text-yellow-500' :
           'text-green-500'
         )}>
-          {valueDb > -60 ? `${valueDb.toFixed(2)}` : '-∞'}
+          {valueDb > -60 ? `${valueDb.toFixed(1)}` : '-∞'}
         </div>
       </div>
     </div>