Create-activity form switched to FormDrawer (width 920, footer submit),
20-row pagination threshold on campaign and sub-run tables. Report
drawer stays a plain Drawer (read-only with export action). Timeline,
exploration, and analysis interactions unchanged.
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.
