Delete confirmations already existed (d7514f4), so no behavior fix was
needed. Switch empty states to antd Empty (table + category tree) and
apply the 20-row pagination standard.
Extract the standard form drawer (width 640, footer actions, destroyOnClose)
as FormDrawer; reuse existing usePolling hook. IntelligentEvals becomes the
first consumer — create drawer and both 5s pollings switched with zero
behaviour change. Includes ui-consistency spec, tickets, and ADR-0005.