style: change gaps between floating elements from 2 (8px) to 1 (4px) (#6226)

## Summary

Design request

**Before**

<img width="2643" height="2074" alt="Screenshot from 2025-10-23
11-16-26"
src="https://github.com/user-attachments/assets/1c93879e-bfc4-4054-b0dd-ee0cd296a7ca"
/>

**After**

<img width="2643" height="2074" alt="Screenshot from 2025-10-23
11-16-13"
src="https://github.com/user-attachments/assets/b9327dcc-9b97-424a-8b05-4f5d62beeefa"
/>

## Related

- https://github.com/Comfy-Org/ComfyUI_frontend/pull/6120

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6226-style-change-gaps-between-floating-elements-from-2-8px-to-1-4px-2956d73d3650815b8640c5f3891fe494)
by [Unito](https://www.unito.io)

---------

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

src/components/LiteGraphCanvasSplitterOverlay.vue

@@ -42,7 +42,7 @@
           <slot name="topmenu" :sidebar-panel-visible="sidebarPanelVisible" />
 
           <Splitter
-            class="splitter-overlay splitter-overlay-bottom mr-2 mb-2 ml-2 flex-1"
+            class="splitter-overlay splitter-overlay-bottom mr-1 mb-1 ml-1 flex-1"
             layout="vertical"
             :pt:gutter="
               'rounded-tl-lg rounded-tr-lg ' +