Mobile ui (#227)

* Basic grid setup

* Fixing thumb on two-up

* Adding margin so you can still access the two-up

* Allow multi-panel to keep one open only

* Edge cases for one-open

* Abstracting results so it can be used as a heading.

* Ordering of items in mobile view. Changing scrolling element.

* Adding labels to collapsed view

* Adding height animation to multi-panel

* Fixing animation bugs

* Expand/collapse icon

* Allow two-up and pinch-zoom to work beneath controls

* Range bubble now behaves properly on mobile

* No longer need this.

* Prevent options overflow at larger widths

src/components/results/FileSize.tsx

@@ -0,0 +1,41 @@
+import { h, Component } from 'preact';
+import * as prettyBytes from 'pretty-bytes';
+import * as style from './style.scss';
+
+interface Props {
+  blob: Blob;
+  compareTo?: Blob;
+}
+
+interface State {}
+
+export default class FileSize extends Component<Props, State> {
+  render({ blob, compareTo }: Props) {
+    let comparison: JSX.Element | undefined;
+
+    if (compareTo) {
+      const delta = blob.size / compareTo.size;
+      if (delta > 1) {
+        const percent = Math.round((delta - 1) * 100) + '%';
+        comparison = (
+          <span class={`${style.sizeDelta} ${style.sizeIncrease}`}>
+            {percent === '0%' ? 'slightly' : percent} bigger
+          </span>
+        );
+      } else if (delta < 1) {
+        const percent = Math.round((1 - delta) * 100) + '%';
+        comparison = (
+          <span class={`${style.sizeDelta} ${style.sizeDecrease}`}>
+            {percent === '0%' ? 'slightly' : percent} smaller
+          </span>
+        );
+      } else {
+        comparison = (
+          <span class={style.sizeDelta}>no change</span>
+        );
+      }
+    }
+
+    return <span>{prettyBytes(blob.size)} {comparison}</span>;
+  }
+}