Template:Category/sidebox-header
From Miniscope
Opens the top half of a SemanticSchemas category sidebox: the `{|` frame plus the heading row. Pairs with `Category/sidebox-footer`. See `Category/table-header` for the broader composition pattern.
Visual styling (float, width, background, border, shadow) lives in `resources/ext.semanticschemas.basecontent.css` keyed off the `source-semanticschemas-sidebox` class, so skins theme the sidebox through the cascade and Codex tokens supply dark-mode support.
Parameters:
- category - The category name. Required.
- label - Optional baked display label.