send processing album colors to a background thread

- use white color as default album page play button color
- return 404 if album is None on get_album_bio()

src/views/AlbumView.vue

@@ -4,21 +4,20 @@
       <div>
         <Header :album="album.info" />
       </div>
-      <div class="separator" id="av-sep"></div>
       <div class="songs rounded">
         <SongList :tracks="album.tracks" :on_album_page="true" />
       </div>
-      <div class="separator" id="av-sep"></div>
       <div
         id="bottom-items"
         class="rounded"
         ref="albumbottomcards"
         @click="expandBottom"
       >
-        <FeaturedArtists :artists="album.artists" /> <div v-if="album.bio">
-        <div class="separator" id="av-sep"></div>
-        <AlbumBio :bio="album.bio" />
-      </div>
+        <FeaturedArtists :artists="album.artists" />
+        <div v-if="album.bio">
+          <div class="separator" id="av-sep"></div>
+          <AlbumBio :bio="album.bio" />
+        </div>
       </div>
     </div>
   </div>
@@ -43,16 +42,7 @@ onBeforeRouteUpdate(async (to) => {
   album.fetchBio(to.params.hash.toString());
 });
 
-function increaseBottomHeight(e: WheelEvent) {
-  e.preventDefault();
-  console.log(e.ctrlKey);
-  const elem = albumbottomcards.value;
-  const pos = elem.offsetHeight + 100;
-
-  elem.style.height = `${pos}px`;
-}
-
-function expandBottom(){
+function expandBottom() {
   const elem = albumbottomcards.value;
   elem.style.height = `${40}rem`;
 }
@@ -62,12 +52,10 @@ function expandBottom(){
 .al-view {
   scrollbar-width: none;
   height: 100%;
-  // border: solid red 1px;
   position: relative;
   overflow: hidden;
 
   .al-content {
-    // border: solid blue 1px;
     height: 100%;
     overflow: auto;
     padding-bottom: 17rem;
@@ -75,6 +63,7 @@ function expandBottom(){
 
   .songs {
     min-height: calc(100% - 31.5rem);
+    margin-top: $small;
   }
 
   &::-webkit-scrollbar {
@@ -88,7 +77,6 @@ function expandBottom(){
   #bottom-items {
     z-index: 77;
     padding: $small;
-    // border: solid red;
     position: absolute;
     bottom: 0;
     width: 100%;