Style: Design System use across more components (#6705)

## Summary

Only remaining use is in `buttonTypes.ts` which @viva-jinyi is going to
be working on to consolidate our different buttons soon.

## Changes

- **What**: Replace light/dark colors with theme aware design system
tokens.

## Review Focus

Double check the chosen colors for the components

## Screenshots

| Before | After |
| ------ | ----- |
| <img width="607" height="432" alt="image"
src="https://github.com/user-attachments/assets/6c0ee6d6-819f-40b1-b775-f8b25dd18104"
/> | <img width="646" height="488" alt="image"
src="https://github.com/user-attachments/assets/9c8532de-8ac6-4b48-9021-3fd0b3e0bc63"
/> |

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6705-Style-WIP-Design-System-use-across-more-components-2ab6d73d365081619115fc5f87a46341)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/components/button/IconGroup.vue

@@ -10,8 +10,7 @@ import { cn } from '@/utils/tailwindUtil'
 const iconGroupClasses = cn(
   'flex justify-center items-center shrink-0',
   'outline-hidden border-none p-0 rounded-lg',
-  'bg-white dark-theme:bg-zinc-700',
-  'text-neutral-950 dark-theme:text-white',
+  'bg-secondary-background shadow-sm',
   'transition-all duration-200',
   'cursor-pointer'
 )