fix: waveform container now expands with zoom for horizontal scrolling

components/tracks/Track.tsx

@@ -726,6 +726,9 @@ export function Track({
       {/* Right: Waveform Area (Flexible Width) */}
       <div
         className="flex-1 relative bg-waveform-bg border-b border-l border-border"
+        style={{
+          minWidth: track.audioBuffer ? `${duration * zoom * 100}px` : undefined
+        }}
       >
         {/* Delete Button - Top Right Overlay */}
         <button