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/SkeletonPlaceholder/SkeletonPlaceholder.svelte

@@ -4,8 +4,12 @@
   export let style = undefined;
 
   import { cx } from '../../lib';
-
-  const _class = cx('--skeleton__placeholder', className);
 </script>
 
-<div on:click on:mouseover on:mouseenter on:mouseleave {style} class={_class} />
+<div
+  on:click
+  on:mouseover
+  on:mouseenter
+  on:mouseleave
+  class={cx('--skeleton__placeholder', className)}
+  {style} />