Style: Fix move cursors that should be grabs (#5989)

## Summary

Align with designs that use `grab`/`grabbing` instead of `move`.

## Review Focus

Additionally
- Fixes the use of `@apply` in the places I touched
- Removed some `style.css` rules that were always overridden by the
component

## Screenshots

### Before 


https://github.com/user-attachments/assets/9ca65b92-33e5-4feb-853c-9c5ece574ab5


### After


https://github.com/user-attachments/assets/51569025-0156-473e-be93-5662c345901b



┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5989-Style-Fix-move-cursors-that-should-be-grabs-2876d73d3650813bbe95c761c5d46e03)
by [Unito](https://www.unito.io)

packages/design-system/src/css/style.css

@@ -645,13 +645,10 @@ button.comfy-close-menu-btn {
 }
 
 span.drag-handle {
-  width: 10px;
-  height: 20px;
   display: inline-block;
   overflow: hidden;
   line-height: 5px;
   padding: 3px 4px;
-  cursor: move;
   vertical-align: middle;
   margin-top: -0.4em;
   margin-left: -0.2em;