[6.x] Fix inconsistent gray border widths

[JayGeorge]

This resolves #12461.

There was a p-px container wrapped around the publish sections that Jack had added back in August. I asked Jack, and it was initially meant to prevent the border from appearing "chopped off" when overflow was active.

However, that problem seems to have resolved itself, so the p-px container is no longer needed.
To compensate for its removal, I've bumped the panel padding from p-1.5 to p-1.75 so we don't lose the lovely contrast between the panel and the white background

---

Note

Increase panel padding and remove the p-px wrapper around publish sections’ content.

• UI:
  • Panel: Increase padding from p-1.5 to p-1.75 in packages/ui/src/Panel/Panel.vue.
  • Publish Sections: Remove outer div.p-px wrapper and render Primitive/Card directly in resources/js/components/ui/Publish/Sections.vue.

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