Builder snippet expansion (short token in a CSS/style input expands to a CSS block)

[jackgranatowski]

Idea

Let users type a short token (e.g. ?clickable-parent, ?columns, ?fade) into a Bricks/Gutenberg style or CSS input and have the plugin expand it into the corresponding CSS block. This gives builder users a "recipe" DX without a preprocessor.

Why

The pure-CSS framework deliberately has no preprocessor/snippet-expansion mechanism (it's an out-of-scope non-goal there). A builder integration is exactly where this belongs, and it speeds up applying common patterns.

Scope

• A registry of named snippets → CSS blocks (drawn from existing macros/patterns).
• Expansion in the relevant Bricks/Gutenberg input(s); insert-and-edit.
• Keep it explicit/opt-in; no silent global rewriting.

Acceptance

• Typing a known token expands to the documented CSS block in-builder