Auto-apply prose styling / smart spacing to post & rich-text content

[jackgranatowski]

Idea

An opt-in toggle that automatically wraps (or targets) post/rich-text content with the framework's .sf-prose treatment, so blog/editorial content gets correct typography and gap-based spacing without the author adding a class.

Why

The framework provides .sf-prose / .sf-flow (margin reset + adjacent-sibling gaps), but it's opt-in per element. For WordPress content (the_content, block content, WooCommerce descriptions) users want it applied automatically.

Scope

• Setting to enable auto-prose on selected content areas (with a selector allowlist + an "off" escape hatch mirroring .sf-not-prose).
• No layout regressions when disabled.

Acceptance

• Toggle applies prose/smart-spacing to content automatically; per-area allowlist + opt-out