feat: manage waitlist and remove group members

- Add group-waitlist module (list/promote/remove entries)
- Remove attendee with optional atomic promotion from waitlist
- Block removal when attendee has payments (attendee_has_payments)
- Waitlist detail modal matching members UI; optimistic add-to-waitlist
- Responsive tweaks for the members/waitlist tabs

apps/web/src/lib/api.ts

@@ -14,11 +14,15 @@ import type {
   GroupInviteInfoDto,
   GroupList,
   GroupWaitlistEntryDto,
+  GroupWaitlistList,
   InviteTokenResult,
   JoinGroupViaInvite,
   JoinGroupViaInviteResult,
   OnboardingStatusDto,
   ProblemDetails,
+  PromoteGroupWaitlistEntryResult,
+  RemoveAttendeeResult,
+  RemoveGroupWaitlistEntryResult,
 } from '@gruperly/shared'
 
 const API_URL = import.meta.env.VITE_API_URL ?? 'http://localhost:4000'
@@ -122,4 +126,29 @@ export const bulkCreateAttendees = (groupId: string, payload: BulkCreateAttendee
   })
 
 export const getGroupAttendees = (groupId: string, page = 1, pageSize = 20) =>
-  apiFetch<AttendeeList>(`/api/v1/groups/${groupId}/attendees?page=${page}&pageSize=${pageSize}`)
+  apiFetch<AttendeeList>(`/api/v1/groups/${groupId}/attendees?page=${page}&pageSize=${pageSize}`)
+
+export const getGroupWaitlist = (groupId: string, page = 1, pageSize = 100) =>
+  apiFetch<GroupWaitlistList>(`/api/v1/groups/${groupId}/waitlist?page=${page}&pageSize=${pageSize}`)
+
+export const promoteGroupWaitlistEntry = (groupId: string, entryId: string) =>
+  apiFetch<PromoteGroupWaitlistEntryResult>(`/api/v1/groups/${groupId}/waitlist/${entryId}/promote`, {
+    method: 'POST',
+  })
+
+export const removeGroupWaitlistEntry = (groupId: string, entryId: string) =>
+  apiFetch<RemoveGroupWaitlistEntryResult>(`/api/v1/groups/${groupId}/waitlist/${entryId}`, {
+    method: 'DELETE',
+  })
+
+export const removeGroupAttendee = (
+  groupId: string,
+  attendeeId: string,
+  options?: { promoteFromWaitlist?: boolean },
+) =>
+  apiFetch<RemoveAttendeeResult>(
+    `/api/v1/groups/${groupId}/attendees/${attendeeId}${options?.promoteFromWaitlist ? '?promoteFromWaitlist=true' : ''}`,
+    {
+      method: 'DELETE',
+    },
+  )