Add a UI component

A catalogue + retriever for the admin UI building blocks. The real code is the bundled templates/* (generated from the substrate's working source — the source of truth is the code, not this doc). To add a component:

1. Find it in the catalogue below.
2. Read its reference — references/<name>.md — for the exact cp command, the foundation it assumes, its invariants, and how to verify.
3. Follow that reference: copy the template into a route/component and rewire it.

Every component assumes the scaffold-dashboard foundation (the platform layer: UI primitives, the form system, charts, DataTable/CardList, theme tokens). Run scaffold-dashboard — or work inside a fork of the substrate — first. For a new data resource (table + server fns + page) use the standalone add-backend skill; to point at a different backend use add-backend.

Catalogue