refactor queu store to use play track using index

- this allows to have duplicate tracks in queue safely
- store indexes in localstorage instead of track objects.

src/components/contextMenu.vue

@@ -139,7 +139,7 @@ const context = useContextStore();
 
       .children {
         transform: scale(1);
-        transition: transform 0.2s ease-in-out;
+        transition: transform 0.1s ease-in-out;
       }
     }
   }