Style: Font Consistency (#7220)

## Summary

Reduce lower level font definitions in most places. Default to Inter.

See #6912 

## Review Focus

Comic Sans is still an option...

## Screenshots (if applicable)

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┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7220-Style-Font-Consistency-2c26d73d365081348f2dd8909dd9bb8f)
by [Unito](https://www.unito.io)

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>

src/extensions/core/groupNodeManage.css

@@ -2,7 +2,6 @@
   background: var(--bg-color);
   color: var(--fg-color);
   padding: 0;
-  font-family: Arial, Helvetica, sans-serif;
   border-color: black;
   margin: 20vh auto;
   max-height: 60vh;