[Glitch] Add audio player

Port 4190e31626 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/styles/components/media.scss

@@ -333,15 +333,50 @@
 
 }
 
+.audio-player {
+  box-sizing: border-box;
+  position: relative;
+  background: darken($ui-base-color, 8%);
+  border-radius: 4px;
+  padding-bottom: 44px;
+
+  &.editable {
+    border-radius: 0;
+    height: 100%;
+  }
+
+  &__waveform {
+    padding: 15px 0;
+  }
+
+  &__progress-placeholder {
+    background-color: rgba(lighten($ui-highlight-color, 8%), 0.5);
+  }
+
+  &__wave-placeholder {
+    background-color: lighten($ui-base-color, 16%);
+  }
+
+  .video-player__controls {
+    padding: 0 15px;
+    padding-top: 10px;
+    background: darken($ui-base-color, 8%);
+    border-top: 1px solid lighten($ui-base-color, 4%);
+    border-radius: 0 0 4px 4px;
+  }
+}
+
 .video-player {
   overflow: hidden;
   position: relative;
   background: $base-shadow-color;
   max-width: 100%;
   border-radius: 4px;
+  box-sizing: border-box;
 
   &.editable {
     border-radius: 0;
+    height: 100% !important;
   }
 
   &:focus {