Migrate to vite and some more stuff

- server: add a `Track` class
- server: add a create_track_class function
- client: migrate from vue-cli to vite

src/components/RightSideBar/NowPlaying.vue

@@ -21,7 +21,7 @@
       </div>
     </div>
     <div class="progress">
-      <div class="duration">{{ fmtMSS(current.length) }}</div>
+      <div class="duration">{{ current.length }}</div>
       <input
         id="progress"
         type="range"

src/components/RightSideBar/UpNext.vue

@@ -31,7 +31,7 @@
           :key="song"
           @click="playThis(song)"
           :class="{
-            currentInQueue: current._id.$oid == song._id.$oid,
+            currentInQueue: current.id == song.id,
           }"
         >
           <div
@@ -42,7 +42,7 @@
           >
             <div
               class="now-playing-track image"
-              v-if="current._id.$oid == song._id.$oid"
+              v-if="current.id == song.id"
               :class="{ active: is_playing, not_active: !is_playing }"
             ></div>
           </div>