feat: add group waitlist functionality

- Introduced GroupWaitlistEntry model in Prisma schema to manage waitlisted users for groups.
- Implemented API route to add users to the group waitlist with validation.
- Enhanced attendee creation logic to handle group capacity and waitlisting scenarios.
- Added new problem builders for handling waitlist-related errors.
- Updated frontend to support waitlist interactions, including modals for capacity warnings.
- Created tests for waitlist functionality, ensuring proper handling of full groups and existing waitlist entries.

apps/web/src/lib/api.ts

@@ -6,13 +6,17 @@ import type {
   ConnectPayment,
   ConnectPaymentResult,
   CreateAttendee,
+  CreateAttendeeResult,
   CreateFirstGroup,
   CreateFirstGroupResult,
+  CreateGroupWaitlistEntry,
   GroupDto,
   GroupInviteInfoDto,
   GroupList,
+  GroupWaitlistEntryDto,
   InviteTokenResult,
   JoinGroupViaInvite,
+  JoinGroupViaInviteResult,
   OnboardingStatusDto,
   ProblemDetails,
 } from '@gruperly/shared'
@@ -87,13 +91,26 @@ export const getInviteInfo = (token: string) =>
   apiFetch<GroupInviteInfoDto>(`/api/v1/invitations/${token}`)
 
 export const joinViaInvite = (token: string, payload: JoinGroupViaInvite) =>
-  apiFetch<{ attendee: AttendeeDto; message: string }>(`/api/v1/invitations/${token}/join`, {
+  apiFetch<JoinGroupViaInviteResult>(`/api/v1/invitations/${token}/join`, {
     method: 'POST',
     body: JSON.stringify(payload),
   })
 
-export const createAttendee = (groupId: string, payload: CreateAttendee) =>
-  apiFetch<AttendeeDto>(`/api/v1/groups/${groupId}/attendees`, {
+export const createAttendee = (
+  groupId: string,
+  payload: CreateAttendee,
+  options?: { allowOverflow?: boolean },
+) =>
+  apiFetch<CreateAttendeeResult>(
+    `/api/v1/groups/${groupId}/attendees${options?.allowOverflow ? '?allowOverflow=true' : ''}`,
+    {
+      method: 'POST',
+      body: JSON.stringify(payload),
+    },
+  )
+
+export const addToGroupWaitlist = (groupId: string, payload: CreateGroupWaitlistEntry) =>
+  apiFetch<GroupWaitlistEntryDto>(`/api/v1/groups/${groupId}/waitlist`, {
     method: 'POST',
     body: JSON.stringify(payload),
   })