Port dashboard pages

A Port dashboard page is a sidebar entry made of one or more widgets (tables, charts, markdown, links, and more) arranged in a 12-column grid. This skill is reference-only: static knowledge about widget schemas, the layout grid, sidebar placement, and dataset filter syntax, drawn from Port's dashboard page schema and public docs. It doesn't need a live Port account or MCP server to produce a correct dashboard payload, only a real account to actually create the page.