refactor(components): convert const to reactive where appropriate

- Inline class assignments to avoid script-level clutter
- Ignore a11y-missing-attribute instead of redundant href

src/components/Tile/ClickableTile.svelte

@@ -8,26 +8,17 @@
   export let style = undefined;
 
   import { cx } from '../../lib';
-
-  $: _class = cx(
-    '--link',
-    '--tile',
-    '--tile--clickable',
-    clicked && '--tile--is-clicked',
-    light && '--tile--light',
-    className
-  );
 </script>
 
 <a
-  class={_class}
+  class={cx('--link', '--tile', '--tile--clickable', clicked && '--tile--is-clicked', light && '--tile--light', className)}
   on:click
   on:click={() => {
     clicked = !clicked;
   }}
   on:keydown
-  on:keydown={event => {
-    if (event.key === ' ' || event.key === 'Enter') {
+  on:keydown={({ key }) => {
+    if (key === ' ' || key === 'Enter') {
       clicked = !clicked;
     }
   }}