feat(admin): streamline group management

design/us-013-admin-user-management.md

@@ -3,7 +3,7 @@ type: User Story
 title: Manage users as an administrator
 description: Authorized operators search users and maintain their names, linked accounts, primaries, and Discord nicknames.
 tags: [admin, users, minecraft, discord]
-timestamp: 2026-08-02T14:12:43Z
+timestamp: 2026-08-02T15:03:59Z
 story_id: US-013
 status: verified
 ---
@@ -28,6 +28,10 @@ As an administrator, I want to manage a user's identity and Minecraft accounts,
 - [x] Selecting a group immediately applies the assignment; selecting `everyone` removes the explicit assignment.
 - [x] Group changes preserve the active user search and show accessible success or error feedback.
 - [x] Registry assignment changes revalidate administrator authorization, user existence, and group existence, and audit the previous and new effective groups.
+- [x] User rows and group-assignment controls are reusable between the Users registry and group-member details.
+- [x] Group details show only the group's effective members with identity, Discord, primary-account, account-count, status, and group columns.
+- [x] Changing a user's group requires modal confirmation and choosing `everyone` removes the explicit assignment.
+- [x] Moving a member to another group removes that user from the current effective-member list after confirmation.
 
 # Implementation
 
@@ -35,6 +39,7 @@ As an administrator, I want to manage a user's identity and Minecraft accounts,
 - [`apps/web/src/app/admin/(console)/users/[userId]/page.tsx`](../apps/web/src/app/admin/%28console%29/users/%5BuserId%5D/page.tsx)
 - [`apps/web/src/app/admin/(console)/users/actions.ts`](../apps/web/src/app/admin/%28console%29/users/actions.ts)
 - [`apps/web/src/components/user-group-select.tsx`](../apps/web/src/components/user-group-select.tsx)
+- [`apps/web/src/components/admin-user-table.tsx`](../apps/web/src/components/admin-user-table.tsx)
 
 # Validation