Refine documentation typography hierarchy

[cachafla]

Pull Request Description

What and why?

Refines the documentation typography so it feels closer to the ValidMind product while preserving a comfortable long-form reading size.

• uses the existing Inter variable font across the available weight range instead of registering only Regular
• aligns the heading scale and tracking with ValidMind's 30/24/20/18px hierarchy
• steps Quarto-authored sections down visually beneath the generated page title
• constrains prose to 75 characters while leaving callouts and cards unconstrained
• softens section dividers

Before and after

Before	After

How to test

• skills/validmind-docs-coverage/scripts/render-pages.sh site/releases/cmvm/26.07/release-notes.qmd
• skills/validmind-docs-coverage/scripts/render-pages.sh site/guide/inventory/working-with-the-inventory.qmd
• Rendered the exact 26.09 candidate release-note source from validmind/release-notes#138 locally for the after screenshot.
• cd site && quarto render --profile development — completed all 793 pages. The render retains existing unresolved generated API-reference warnings.

Preview link: pending the validate deployment.

What needs special review?

• Whether the 30/24/20/18px hierarchy feels sufficiently close to the product without making long-form docs too dense.
• Whether the 75-character prose measure works across guides as well as full-width release notes.

Dependencies, breaking changes, and deployment notes

No dependencies or breaking changes. This is a global theme change, so CI should perform the complete preview render.

Release notes

Documentation now uses a clearer typography hierarchy aligned with the ValidMind platform, with tighter headings and more readable line lengths.

Checklist

• What and why
• Screenshots or videos (Frontend)
• How to test
• What needs special review
• Dependencies, breaking changes, and deployment notes
• Labels applied
• PR linked to Shortcut — not applicable
• Unit tests added (Backend) — not applicable
• Tested locally
• Documentation updated
• Environment variable additions/changes documented — not applicable