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/services/colorPaletteService.ts

@@ -101,7 +101,7 @@ export const useColorPaletteService = () => {
     linkColorPalette: Colors['node_slot']
   ) {
     if (!linkColorPalette) return
-    const rootStyle = document.getElementById('vue-app')?.style
+    const rootStyle = document.body?.style
     if (!rootStyle) return
 
     for (const dataType of nodeDefStore.nodeDataTypes) {
@@ -122,7 +122,7 @@ export const useColorPaletteService = () => {
     colorPaletteId: string
   ) {
     if (!palette) return
-    const rootStyle = document.getElementById('vue-app')?.style
+    const rootStyle = document.body?.style
     if (!rootStyle) return
 
     for (const themeVar of Object.keys(THEME_PROPERTY_MAP)) {