feat: add real edit mode to agency docket wizard

Author: brianfunk

docs/plan/M03-agency-operations.md

@@ -43,3 +43,4 @@ Replace mock agency workflows with real data operations.
 - 2026-02-11: Updated moderation logic to canonical comment statuses (`under_review`/`published`) with compatibility mapping for legacy values and persisted moderation logging.
 - 2026-02-11: Replaced mock agency dashboard data in `src/pages/agency/AgencyDashboard.tsx` with real agency analytics, moderation queue, and docket summary queries.
 - 2026-02-11: Replaced mock docket detail workflow in `src/pages/agency/DocketDetail.tsx` with real Supabase reads/writes, moderation actions, supporting-document retrieval, and audit/moderation activity history.
+- 2026-02-11: Implemented real docket edit-mode behavior in `src/pages/agency/DocketWizard.tsx`, including preload/update of existing docket settings and additive supporting document uploads.