Use explicit values, inspect every generated line and keep the source document meaningful before visual placement.
Make both columns explicit
Use minmax(200px, 1fr) for the sidebar and 3fr for content, one 1fr row and a 24 px column gap. Name the left cell sidebar and the right cell content. If a second row is added only for later content, its uncovered cells appear as dots until you create another valid rectangle. Test the 200 px floor with long labels and zoom; add a source-respecting one-column breakpoint in the real component before release.
Verify the real document order
GridWeave previews the validated visual grid, not the meaning or reading order of your page. Keep source HTML in a logical sequence that works before layout CSS, then test keyboard navigation, zoom, long translated text, narrow widths and assistive technology in the real component. Add responsive breakpoints deliberately in your own stylesheet: the generated explicit tracks describe only the current layout. The capsule stores no layout, so keep accepted CSS and HTML in source control.