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/card/CardContainer.vue

@@ -47,8 +47,8 @@ const containerClasses = computed(() => {
   // Variant styles
   const variantClasses = {
     default: cn(
-      hasBackground && 'bg-white dark-theme:bg-zinc-800',
-      hasBorder && 'border border-zinc-200 dark-theme:border-zinc-700',
+      hasBackground && 'bg-modal-card-background',
+      hasBorder && 'border border-border-default',
       hasShadow && 'shadow-sm',
       hasCursor && 'cursor-pointer'
     ),
@@ -57,9 +57,9 @@ const containerClasses = computed(() => {
       'p-2 transition-colors duration-200'
     ),
     outline: cn(
-      hasBorder && 'border-2 border-zinc-300 dark-theme:border-zinc-600',
+      hasBorder && 'border-2 border-border-subtle',
       hasCursor && 'cursor-pointer',
-      'hover:border-zinc-400 dark-theme:hover:border-zinc-500 transition-colors'
+      'hover:border-border-subtle/50 transition-colors'
     )
   }
 

src/components/card/CardDescription.vue

@@ -1,7 +1,5 @@
 <template>
-  <div class="line-clamp-2 h-7 text-xs text-zinc-500 dark-theme:text-zinc-400">
+  <div class="line-clamp-2 h-7 text-xs text-muted-foreground">
     <slot></slot>
   </div>
 </template>
-
-<script setup lang="ts"></script>