feat: implement mute video tracks

apps/web/src/components/editor/preview-panel.tsx

@@ -235,7 +235,7 @@ export function PreviewPanel() {
     const activeElements: ActiveElement[] = [];
 
     // Iterate tracks from bottom to top so topmost track renders last (on top)
-    ;[...tracks].reverse().forEach((track) => {
+    [...tracks].reverse().forEach((track) => {
       track.elements.forEach((element) => {
         if (element.hidden) return;
         const elementStart = element.startTime;
@@ -436,7 +436,7 @@ export function PreviewPanel() {
               trimStart={element.trimStart}
               trimEnd={element.trimEnd}
               clipDuration={element.duration}
-              trackMuted={elementData.track.muted}
+              trackMuted={element.muted || elementData.track.muted}
             />
           </div>
         );
@@ -462,14 +462,18 @@ export function PreviewPanel() {
       // Audio elements (no visual representation)
       if (mediaItem.type === "audio") {
         return (
-          <div key={element.id} className="absolute inset-0" style={{ pointerEvents: "none" }}>
+          <div
+            key={element.id}
+            className="absolute inset-0"
+            style={{ pointerEvents: "none" }}
+          >
             <AudioPlayer
               src={mediaItem.url!}
               clipStartTime={element.startTime}
               trimStart={element.trimStart}
               trimEnd={element.trimEnd}
               clipDuration={element.duration}
-              trackMuted={elementData.track.muted}
+              trackMuted={element.muted || elementData.track.muted}
             />
           </div>
         );