- Add backend/internal/web/ui/catalog/catalog.templ: single-page layout
with 240px sidebar nav (11 anchor links) and 11 component sections with
section headings matching DS-XX requirement IDs
- Add backend/internal/web/ui/catalog/examples.go: Example struct + typed
example functions for all 11 component types (badge/button/card/empty-state/
form-field/icon-button/input/modal/select/table/textarea); modal renders
panel-only (no backdrop wrapper, Pitfall 7)
- Add backend/internal/web/catalog_route_catalog.go (//go:build catalog):
RegisterCatalogRoute mounts GET /ui-catalog via catalogPageHandler()
- Add backend/internal/web/catalog_route_stub.go (//go:build !catalog):
no-op RegisterCatalogRoute for production builds
- Wire RegisterCatalogRoute(r) unconditionally in NewRouter after protected routes
- Add justfile catalog target: just generate + go run -tags catalog ./cmd/web
- go build ./... and go build -tags catalog ./... both pass; go test ./... green
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