fix stone-100 and stone-200 color variable values swapped (#5923)

## Summary

The `stone-100` and `stone-200` were flipped. This PR swaps them to
align with [color
variables](https://www.figma.com/design/vALUV83vIdBzEsTJAhQgXq/Comfy-Design-System?node-id=0-1&p=f&vars=1&var-id=538-1913&m=dev)

<img width="813" height="321" alt="image"
src="https://github.com/user-attachments/assets/9b2a19ff-566c-425b-a4fe-9998578b872a"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5923-fix-stone-100-and-stone-200-color-variable-values-swapped-2826d73d3650815c8c4ae0627aa045d9)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <[email protected]>

Author: christian-byrne

browser_tests/tests/vueNodes/nodeStates/colors.spec.ts-snapshots/vue-node-custom-colors-light-all-colors-chromium-linux.png

@@ -68,8 +68,8 @@
 
   --color-neutral-550: #636363;
 
-  --color-stone-100: #444444;
-  --color-stone-200: #828282;
+  --color-stone-100: #828282;
+  --color-stone-200: #444444;
   --color-stone-300: #bbbbbb;
 
   --color-ivory-100: #fdfbfa;