Optional global auto-radius for media (img / figure)

[jackgranatowski]

Problem

Today only code/pre receive a default border-radius in core/base.css; img/figure get none globally (radius is applied only inside .sf-prose via --sf-prose-media-radius). Many designs want rounded media by default.

Scope

• An opt-in token + rule, e.g. --sf-media-radius applied via :where(img, figure) (guarded so it can be disabled/zeroed globally).
• Must not fight .sf-bg/object-fit media or full-bleed patterns.

Acceptance

• Opt-in global media radius via a single token
• Off by default or trivially disablable; documented

[jackgranatowski]

Shipped (active) in core/base.css/core/tokens.css via #546.

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