Small utilities: .sf-list-none and alternate selection (.sf-selection--alt)

[jackgranatowski]

Problem

Two small, common helpers are missing:

1. .sf-list-none — reset list styling (marker + inline padding) in one class.
2. .sf-selection--alt — an alternate ::selection colour context for elements where the default selection colours have poor contrast (e.g. on coloured surfaces).

Scope

• .sf-list-none in the utilities layer.
• .sf-selection--alt overriding --sf-color-selection-bg/-text on the element and its descendants.

Acceptance

• Both emitted (opt-in) and documented

[jackgranatowski]

Already shipped on main: both .sf-list-none and .sf-selection--alt are implemented in optional/utilities.css (opt-in) and documented. Closing as completed.

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