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/FormItem/FormItem.svelte

@@ -4,10 +4,8 @@
   export let style = undefined;
 
   import { cx } from '../../lib';
-
-  const _class = cx('--form-item', className);
 </script>
 
-<div on:click on:mouseover on:mouseenter on:mouseleave class={_class} {style}>
+<div on:click on:mouseover on:mouseenter on:mouseleave class={cx('--form-item', className)} {style}>
   <slot />
 </div>