use $$restProps in Textarea atom (#56)

Add `$$restProps.class` to the `cn(...)` in Textarea atom

src/lib/atoms/Textarea.stories.svelte

@@ -48,3 +48,13 @@
 >
   <Textarea {label} {placeholder} {isRequired} {value} {error} />
 </Story>
+
+<!-- Extra classes Example -->
+<Story
+  name="Textarea + Class"
+  args={{
+    label: 'Textarea with extra classes',
+  }}
+>
+  <Textarea {label} {placeholder} {value} class="h-f160"></Textarea>
+</Story>

src/lib/atoms/Textarea.svelte

@@ -14,7 +14,8 @@
   <textarea
     class={cn(
       'border-input aria-[invalid]:border-destructive data-[placeholder]:[&>span]:text-muted-foreground sm flex h-10 w-full max-w-[388px] items-center justify-between rounded-md border bg-white px-3 py-2 focus-visible:outline-none disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1',
-      error ? 'border-2 border-error' : 'border border-gray3'
+      error ? 'border-2 border-error' : 'border border-gray3',
+      $$restProps.class
     )}
     {placeholder}
     bind:value