added popover to lcd artwork, replaced mini with cast button

src/renderer/less/helpers.less

@@ -485,4 +485,25 @@
       }
     }
   }
+}
+
+.mediainfo-popover {
+  user-select: none;
+  .popover-artwork {
+    width: 200px;
+    height: 200px;
+    margin: 0 0 20px 0;
+  }
+
+  .song-name {
+    font-weight: 600;
+  }
+  .song-artist,.song-album {
+    opacity: 0.75;
+    cursor: pointer;
+
+    &:hover {
+      text-decoration: underline;
+    }
+  }
 }