feat(library): make virtual scroll buffer reactive to window height

The virtual scroller now uses the windows's height times 1.5 as the size of the buffer. This loads
13 rows of 8 items on a 1920x1080 screen, further reducing pop-in when scrolling fast. The
multiplier is expected to be adjusted through testing on more devices down the line.

pages/library/_viewId.vue

@@ -10,7 +10,7 @@
       class="scroller"
       :items="itemsChunks"
       :min-item-size="350"
-      :buffer="600"
+      :buffer="$vuetify.breakpoint.height * 1.5"
       page-mode
     >
       <template v-slot="{ item, index, active }">