H-6450: Reduce space around entity headers

[CiaranMn]

🌟 What is the purpose of this PR?

There's a lot of white space around the header on both the entities page and on individual entity views.

I don't know how long this has been here but it takes up a lot of screen real estate at the expense of meaningful content.

This PR reduces it (see difference below).

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

📹 Demo

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[cursor]

PR Summary

Low Risk
Low risk visual-only spacing tweaks to header layout on entities listing and entity detail views; no behavior, data, or API changes.

Overview
Reduces vertical whitespace in entity headers to show more content above the fold.

On entities.page.tsx, removes the extra vertical margin on the page title. On entity-header.tsx, decreases the top margin above EntityEditorTabs when tabs are shown.

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[augmentcode]

🤖 Augment PR Summary

Summary: Reduces excessive whitespace around entity page headers to reclaim vertical screen space.

Changes:

• Removed extra vertical margin from the entities page h1 title.
• Reduced top margin before entity editor tabs within the entity header component.

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[augmentcode]

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[vilkinsons]

Breadcrumbs to be moved up into slideover top-bar (per in-person convo).