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/routes/group-detail.tsx

@@ -1,7 +1,14 @@
 import { useState, useRef, type ReactNode } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { useParams, useNavigate, Link } from '@tanstack/react-router';
-import type { AttendeeDto, CreateAttendee, CreateAttendeeResult, CreateGroupWaitlistEntry } from '@gruperly/shared';
+import type {
+  AttendeeDto,
+  CreateAttendee,
+  CreateAttendeeResult,
+  CreateGroupWaitlistEntry,
+  GroupWaitlistEntryDto,
+  GroupWaitlistList,
+} from '@gruperly/shared';
 import {
   ArrowLeft,
   CalendarClock,
@@ -23,6 +30,8 @@ import {
   StickyNote,
   Trash2,
   UploadCloud,
+  UserCheck,
+  UserMinus,
   UserPlus,
   Users,
 } from 'lucide-react';
@@ -34,7 +43,11 @@ import {
   createAttendee,
   getGroup,
   getGroupAttendees,
+  getGroupWaitlist,
   getInviteToken,
+  promoteGroupWaitlistEntry,
+  removeGroupAttendee,
+  removeGroupWaitlistEntry,
 } from '../lib/api';
 import {
   downloadAttendeeTemplateCsv,
@@ -56,6 +69,9 @@ export function GroupDetailView() {
   const [isAddAttendeeModalOpen, setIsAddAttendeeModalOpen] = useState(false);
   const [selectedAttendee, setSelectedAttendee] = useState<AttendeeDto | null>(null);
   const [activeTab, setActiveTab] = useState<'quick' | 'bulk'>('quick');
+  const [listSection, setListSection] = useState<'members' | 'waitlist'>('members');
+  const [attendeeToRemove, setAttendeeToRemove] = useState<AttendeeDto | null>(null);
+  const [selectedWaitlistEntry, setSelectedWaitlistEntry] = useState<GroupWaitlistEntryDto | null>(null);
 
   // Quick form state
   const [firstName, setFirstName] = useState('');
@@ -98,6 +114,12 @@ export function GroupDetailView() {
     enabled: Boolean(groupId),
   });
 
+  const waitlistQuery = useQuery({
+    queryKey: ['group-waitlist', groupId],
+    queryFn: () => getGroupWaitlist(groupId, 1, 100),
+    enabled: Boolean(groupId),
+  });
+
   // Regenerate invite token mutation
   const regenerateTokenMutation = useMutation({
     mutationFn: () => getInviteToken(groupId, true),
@@ -161,12 +183,43 @@ export function GroupDetailView() {
   // Add to group waitlist
   const addToWaitlistMutation = useMutation({
     mutationFn: (payload: CreateGroupWaitlistEntry) => addToGroupWaitlist(groupId, payload),
+    onMutate: async (payload: CreateGroupWaitlistEntry) => {
+      await queryClient.cancelQueries({ queryKey: ['group-waitlist', groupId] });
+      const previousWaitlist = queryClient.getQueryData<GroupWaitlistList>(['group-waitlist', groupId]);
+
+      if (previousWaitlist) {
+        const optimisticEntry: GroupWaitlistEntryDto = {
+          id: `temp-${Date.now()}`,
+          groupId,
+          fullName: `${payload.firstName} ${payload.lastName ?? ''}`.trim(),
+          phone: payload.phone,
+          email: payload.email || null,
+          notes: payload.notes ?? null,
+          status: 'PENDING',
+          createdAt: new Date().toISOString(),
+          updatedAt: new Date().toISOString(),
+        };
+        queryClient.setQueryData<GroupWaitlistList>(['group-waitlist', groupId], {
+          data: [optimisticEntry, ...previousWaitlist.data],
+          pagination: {
+            ...previousWaitlist.pagination,
+            total: previousWaitlist.pagination.total + 1,
+          },
+        });
+      }
+
+      return { previousWaitlist };
+    },
     onSuccess: (entry) => {
       toast.info(`${entry.fullName} fue agregado a la lista de espera del grupo.`);
-      queryClient.invalidateQueries({ queryKey: ['group-attendees', groupId] });
+      queryClient.invalidateQueries({ queryKey: ['group-waitlist', groupId] });
+      queryClient.invalidateQueries({ queryKey: ['group', groupId] });
       closeAddAttendeeFlow();
     },
-    onError: (err: Error) => {
+    onError: (err: Error, _payload, context) => {
+      if (context?.previousWaitlist) {
+        queryClient.setQueryData<GroupWaitlistList>(['group-waitlist', groupId], context.previousWaitlist);
+      }
       if (err instanceof ApiError && err.problem?.code === 'already_waitlisted') {
         toast.info('Este número ya está en la lista de espera del grupo.');
       } else {
@@ -193,6 +246,63 @@ export function GroupDetailView() {
     },
   });
 
+  // Waitlist & removal mutations
+  const invalidateGroupQueries = () => {
+    queryClient.invalidateQueries({ queryKey: ['group-attendees', groupId] });
+    queryClient.invalidateQueries({ queryKey: ['group-waitlist', groupId] });
+    queryClient.invalidateQueries({ queryKey: ['group', groupId] });
+  };
+
+  const removeAttendeeMutation = useMutation({
+    mutationFn: (payload: { attendeeId: string; promoteFromWaitlist: boolean }) =>
+      removeGroupAttendee(groupId, payload.attendeeId, { promoteFromWaitlist: payload.promoteFromWaitlist }),
+    onSuccess: (result, payload) => {
+      const removedName = attendees.find((a) => a.id === payload.attendeeId)?.fullName ?? 'El miembro';
+      if (result.promoted) {
+        toast.success(`${removedName} fue quitado del grupo y ${result.promoted.fullName} pasó de la lista de espera al grupo.`);
+      } else {
+        toast.success(`${removedName} fue quitado del grupo.`);
+      }
+      invalidateGroupQueries();
+      setSelectedAttendee(null);
+      setAttendeeToRemove(null);
+    },
+    onError: (err: Error) => {
+      if (err instanceof ApiError && err.problem?.code === 'attendee_has_payments') {
+        toast.error(err.problem.detail ?? 'Este miembro tiene cobros asociados.');
+      } else {
+        toast.error(err.message || 'Error al quitar al miembro del grupo.');
+      }
+      setAttendeeToRemove(null);
+    },
+  });
+
+  const promoteWaitlistMutation = useMutation({
+    mutationFn: (entryId: string) => promoteGroupWaitlistEntry(groupId, entryId),
+    onSuccess: (result) => {
+      toast.success(`${result.attendee.fullName} pasó de la lista de espera al grupo.`);
+      invalidateGroupQueries();
+    },
+    onError: (err: Error) => {
+      if (err instanceof ApiError && err.problem?.code === 'group_capacity_reached') {
+        toast.error('El grupo alcanzó su cupo. Quita un miembro o aumenta el cupo primero.');
+      } else {
+        toast.error(err.message || 'No se pudo pasar al miembro al grupo.');
+      }
+    },
+  });
+
+  const removeWaitlistEntryMutation = useMutation({
+    mutationFn: (entry: GroupWaitlistEntryDto) => removeGroupWaitlistEntry(groupId, entry.id),
+    onSuccess: (_result, entry) => {
+      toast.success(`${entry.fullName} fue quitado de la lista de espera.`);
+      invalidateGroupQueries();
+    },
+    onError: (err: Error) => {
+      toast.error(err.message || 'No se pudo quitar de la lista de espera.');
+    },
+  });
+
   const handleCopyLink = async () => {
     const url = inviteTokenQuery.data?.inviteUrl;
     if (!url) return;
@@ -328,6 +438,10 @@ export function GroupDetailView() {
   const group = groupQuery.data;
   const attendees = attendeesQuery.data?.data ?? [];
   const attendeesTotal = attendeesQuery.data?.pagination?.total ?? attendees.length;
+  const waitlistEntries = waitlistQuery.data?.data ?? [];
+  const waitlistTotal = waitlistQuery.data?.pagination?.total ?? waitlistEntries.length;
+  const firstWaitlistEntry = waitlistEntries[0] ?? null;
+  const hasFreeCapacity = group?.capacity == null || attendeesTotal < group.capacity;
   const filteredAttendees = attendees.filter((a) => {
     const q = searchFilter.toLowerCase();
     return (
@@ -375,7 +489,7 @@ export function GroupDetailView() {
       <div>
         <Link
           to="/groups"
-          className="inline-flex items-center gap-1 text-sm text-foreground/60 hover:text-primary transition-colors mb-3"
+          className="hidden lg:inline-flex items-center gap-1 text-sm text-foreground/60 hover:text-primary transition-colors mb-3"
         >
           <ArrowLeft className="size-4" />
           <span>Volver a grupos</span>
@@ -428,9 +542,10 @@ export function GroupDetailView() {
         <div className="flex items-center gap-3">
           <Users className="size-5 text-accent shrink-0" />
           <div>
-            <p className="text-xs font-medium text-foreground/50 uppercase">Miembros & Cupo</p>
+<p className="text-xs font-medium text-foreground/50 uppercase">Miembros & Cupo</p>
             <p className="font-medium text-primary">
-              {attendees.length} inscritos {group.capacity ? `· Cupo de ${group.capacity}` : ''}
+              {attendees.length} inscritos {waitlistTotal > 0 ? ` · ${waitlistTotal} en espera` : ''}
+              {group.capacity ? ` · Cupo de ${group.capacity}` : ''}
             </p>
           </div>
         </div>
@@ -450,108 +565,201 @@ export function GroupDetailView() {
         </div>
       </div>
 
-      {/* Attendees Management Section */}
+      {/* Miembros & Lista de espera */}
       <div className="rounded-xl border border-border bg-surface p-5 space-y-4">
-        <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-3">
-          <div>
-            <h2 className="text-lg font-semibold text-primary">
-              Miembros del Grupo ({attendees.length})
-            </h2>
-            <p className="text-xs text-foreground/60">
-              Listado de todos los miembros incorporados al grupo.
-            </p>
+        <div className="flex flex-col gap-3">
+          <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-3">
+            <div className="flex items-center rounded-xl bg-primary-soft p-1 w-full sm:w-[26rem]">
+              <button
+                type="button"
+                onClick={() => setListSection('members')}
+                className={`flex flex-1 items-center justify-center gap-1.5 py-2 text-xs font-semibold rounded-lg transition-all ${
+                  listSection === 'members'
+                    ? 'bg-surface text-primary shadow-xs'
+                    : 'text-foreground/60 hover:text-primary'
+                }`}
+              >
+                <Users className="size-4 shrink-0" />
+                <span className="whitespace-nowrap">Miembros ({attendeesTotal})</span>
+              </button>
+              <button
+                type="button"
+                onClick={() => setListSection('waitlist')}
+                className={`flex flex-1 items-center justify-center gap-1.5 py-2 text-xs font-semibold rounded-lg transition-all ${
+                  listSection === 'waitlist'
+                    ? 'bg-surface text-primary shadow-xs'
+                    : 'text-foreground/60 hover:text-primary'
+                }`}
+              >
+                <Clock className="size-4 shrink-0" />
+                <span className="whitespace-nowrap">Lista de espera ({waitlistTotal})</span>
+              </button>
+            </div>
+
+            {listSection === 'members' ? (
+              <div className="relative w-full sm:w-64">
+                <Search className="absolute left-3 top-2.5 size-4 text-foreground/40" />
+                <Input
+                  placeholder="Buscar por nombre o teléfono..."
+                  value={searchFilter}
+                  onChange={(e) => setSearchFilter(e.target.value)}
+                  className="pl-9 h-9 text-xs"
+                />
+              </div>
+            ) : null}
           </div>
 
-          <div className="relative w-full sm:w-64">
-            <Search className="absolute left-3 top-2.5 size-4 text-foreground/40" />
-            <Input
-              placeholder="Buscar por nombre o teléfono..."
-              value={searchFilter}
-              onChange={(e) => setSearchFilter(e.target.value)}
-              className="pl-9 h-9 text-xs"
-            />
-          </div>
+          <p className="text-xs text-foreground/60">
+            {listSection === 'members'
+              ? 'Listado de todos los miembros incorporados al grupo.'
+              : 'Personas que esperan un cupo libre en el grupo. Al pasar a alguien al grupo, se crea automáticamente su registro como miembro.'}
+          </p>
         </div>
 
-        {attendeesQuery.isPending ? (
-          <div className="flex items-center justify-center py-12">
-            <Loader2 className="size-6 animate-spin text-accent" />
-          </div>
-        ) : null}
+        {listSection === 'members' ? (
+          <>
+            {attendeesQuery.isPending ? (
+              <div className="flex items-center justify-center py-12">
+                <Loader2 className="size-6 animate-spin text-accent" />
+              </div>
+            ) : null}
 
-        {attendeesQuery.isSuccess && attendees.length === 0 ? (
-          <div className="rounded-xl border border-dashed border-border py-12 px-4 text-center">
-            <Users className="size-10 text-foreground/30 mx-auto mb-2" />
-            <p className="font-medium text-primary">Todavía no hay miembros en este grupo</p>
-            <p className="text-sm text-foreground/60 mt-1 max-w-sm mx-auto">
-              Puedes compartir el enlace de invitación único o agregar miembros de forma manual o masiva.
-            </p>
-            <div className="mt-4 flex items-center justify-center gap-3">
-              <Button
-                variant="outline"
-                size="sm"
-                onClick={() => setIsInviteModalOpen(true)}
-                className="gap-2"
-              >
-                <Share2 className="size-4" />
-                Compartir Enlace
-              </Button>
-              <Button
-                variant="primary"
-                size="sm"
-                onClick={() => setIsAddAttendeeModalOpen(true)}
-                className="gap-2"
-              >
-                <Plus className="size-4" />
-                Agregar Miembros
-              </Button>
-            </div>
-          </div>
-        ) : null}
-
-        {attendeesQuery.isSuccess && attendees.length > 0 && filteredAttendees.length === 0 ? (
-          <div className="py-8 text-center text-sm text-foreground/60">
-            No se encontraron miembros que coincidan con la búsqueda.
-          </div>
-        ) : null}
-
-        {filteredAttendees.length > 0 ? (
-          <div className="overflow-x-auto">
-            <table className="w-full text-left text-sm">
-              <thead className="border-b border-border text-xs uppercase text-foreground/60 font-semibold">
-                <tr>
-                  <th className="pb-3 px-3">Nombre</th>
-                  <th className="pb-3 px-3">Teléfono</th>
-                  <th className="pb-3 px-3 w-8" />
-                </tr>
-              </thead>
-              <tbody className="divide-y divide-border">
-                {filteredAttendees.map((attendee) => (
-                  <tr
-                    key={attendee.id}
-                    className="hover:bg-primary-soft/50 transition-colors cursor-pointer"
-                    onClick={() => setSelectedAttendee(attendee)}
+            {attendeesQuery.isSuccess && attendees.length === 0 ? (
+              <div className="rounded-xl border border-dashed border-border py-12 px-4 text-center">
+                <Users className="size-10 text-foreground/30 mx-auto mb-2" />
+                <p className="font-medium text-primary">Todavía no hay miembros en este grupo</p>
+                <p className="text-sm text-foreground/60 mt-1 max-w-sm mx-auto">
+                  Puedes compartir el enlace de invitación único o agregar miembros de forma manual o masiva.
+                </p>
+                <div className="mt-4 flex items-center justify-center gap-3">
+                  <Button
+                    variant="outline"
+                    size="sm"
+                    onClick={() => setIsInviteModalOpen(true)}
+                    className="gap-2"
                   >
-                    <td className="py-3 px-3">
-                      <div className="flex items-center gap-2.5">
-                        <div className="size-8 rounded-full bg-accent/10 text-accent font-semibold flex items-center justify-center text-xs">
-                          {attendee.fullName.charAt(0).toUpperCase()}
-                        </div>
-                        <span className="font-medium text-primary">{attendee.fullName}</span>
-                      </div>
-                    </td>
-                    <td className="py-3 px-3 text-foreground/70">
-                      {attendee.phone || <span className="text-foreground/40">—</span>}
-                    </td>
-                    <td className="py-3 px-1 text-foreground/30">
-                      <ChevronRight className="size-4" />
-                    </td>
-                  </tr>
-                ))}
-              </tbody>
-            </table>
+                    <Share2 className="size-4" />
+                    Compartir Enlace
+                  </Button>
+                  <Button
+                    variant="primary"
+                    size="sm"
+                    onClick={() => setIsAddAttendeeModalOpen(true)}
+                    className="gap-2"
+                  >
+                    <Plus className="size-4" />
+                    Agregar Miembros
+                  </Button>
+                </div>
+              </div>
+            ) : null}
+
+            {attendeesQuery.isSuccess && attendees.length > 0 && filteredAttendees.length === 0 ? (
+              <div className="py-8 text-center text-sm text-foreground/60">
+                No se encontraron miembros que coincidan con la búsqueda.
+              </div>
+            ) : null}
+
+            {filteredAttendees.length > 0 ? (
+              <div className="overflow-x-auto">
+                <table className="w-full text-left text-sm">
+                  <thead className="border-b border-border text-xs uppercase text-foreground/60 font-semibold">
+                    <tr>
+                      <th className="pb-3 px-3">Nombre</th>
+                      <th className="pb-3 px-3">Teléfono</th>
+                      <th className="pb-3 px-3 w-8" />
+                    </tr>
+                  </thead>
+                  <tbody className="divide-y divide-border">
+                    {filteredAttendees.map((attendee) => (
+                      <tr
+                        key={attendee.id}
+                        className="hover:bg-primary-soft/50 transition-colors cursor-pointer"
+                        onClick={() => setSelectedAttendee(attendee)}
+                      >
+                        <td className="py-3 px-3">
+                          <div className="flex items-center gap-2.5">
+                            <div className="size-8 rounded-full bg-accent/10 text-accent font-semibold flex items-center justify-center text-xs">
+                              {attendee.fullName.charAt(0).toUpperCase()}
+                            </div>
+                            <span className="font-medium text-primary">{attendee.fullName}</span>
+                          </div>
+                        </td>
+                        <td className="py-3 px-3 text-foreground/70">
+                          {attendee.phone || <span className="text-foreground/40">—</span>}
+                        </td>
+                        <td className="py-3 px-1 text-foreground/30">
+                          <ChevronRight className="size-4" />
+                        </td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
+              </div>
+            ) : null}
+          </>
+        ) : (
+          <div className="space-y-4">
+            {waitlistQuery.isPending ? (
+              <div className="flex items-center justify-center py-12">
+                <Loader2 className="size-6 animate-spin text-accent" />
+              </div>
+            ) : null}
+
+            {waitlistQuery.isSuccess && waitlistEntries.length === 0 ? (
+              <div className="rounded-xl border border-dashed border-border py-12 px-4 text-center">
+                <Clock className="size-10 text-foreground/30 mx-auto mb-2" />
+                <p className="font-medium text-primary">No hay nadie en la lista de espera</p>
+                <p className="text-sm text-foreground/60 mt-1 max-w-sm mx-auto">
+                  Cuando el grupo alcance su cupo, las personas podrán sumarse a la espera y podrás pasarlas al grupo desde aquí.
+                </p>
+              </div>
+            ) : null}
+
+            {waitlistEntries.length > 0 ? (
+              <div className="overflow-x-auto">
+                <table className="w-full text-left text-sm">
+                  <thead className="border-b border-border text-xs uppercase text-foreground/60 font-semibold">
+                    <tr>
+                      <th className="pb-3 px-3">Nombre</th>
+                      <th className="pb-3 px-3">Teléfono</th>
+                      <th className="pb-3 px-3 w-8" />
+                    </tr>
+                  </thead>
+                  <tbody className="divide-y divide-border">
+                    {waitlistEntries.map((entry) => (
+                      <tr
+                        key={entry.id}
+                        className="hover:bg-primary-soft/50 transition-colors cursor-pointer"
+                        onClick={() => setSelectedWaitlistEntry(entry)}
+                      >
+                        <td className="py-3 px-3">
+                          <div className="flex items-center gap-2.5">
+                            <div className="size-8 rounded-full bg-accent/10 text-accent font-semibold flex items-center justify-center text-xs">
+                              {entry.fullName.charAt(0).toUpperCase()}
+                            </div>
+                            <div className="min-w-0">
+                              <p className="font-medium text-primary truncate">{entry.fullName}</p>
+                              {entry.notes ? (
+                                <p className="text-xs text-foreground/50 truncate">{entry.notes}</p>
+                              ) : null}
+                            </div>
+                          </div>
+                        </td>
+                        <td className="py-3 px-3 text-foreground/70">
+                          {entry.phone}
+                        </td>
+                        <td className="py-3 px-1 text-foreground/30">
+                          <ChevronRight className="size-4" />
+                        </td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
+              </div>
+            ) : null}
           </div>
-        ) : null}
+        )}
       </div>
 
       {/* MODAL: COMPARTIR LINK DE INVITACION */}
@@ -1151,6 +1359,233 @@ export function GroupDetailView() {
                 )}
               </DetailRow>
             </div>
+
+            <div className="pt-2 border-t border-border">
+              <Button
+                variant="ghost"
+                onClick={() => setAttendeeToRemove(selectedAttendee)}
+                className="w-full gap-2 text-danger border border-danger/20 hover:bg-danger/10 hover:text-danger"
+              >
+                <UserMinus className="size-4" />
+                Quitar del grupo
+              </Button>
+            </div>
+          </div>
+        ) : null}
+      </Modal>
+    {/* MODAL: CONFIRMAR QUITAR MIEMBRO */}
+      <Modal
+        isOpen={attendeeToRemove !== null}
+        onClose={() => setAttendeeToRemove(null)}
+        title="Quitar del grupo"
+        maxWidth="md"
+      >
+        {attendeeToRemove ? (
+          <div className="space-y-4">
+            <p className="text-sm text-foreground/70">
+              {attendeeToRemove.fullName} dejará de ser miembro del grupo{' '}
+              <strong className="text-primary">{group.name}</strong>
+              {firstWaitlistEntry ? ' y el cupo quedará libre.' : '.'}
+              {attendeeToRemove.phone ? (
+                <span className="block mt-1 text-xs text-foreground/50">
+                  Teléfono: {attendeeToRemove.phone}
+                </span>
+              ) : null}
+            </p>
+
+            {firstWaitlistEntry ? (
+              <div className="rounded-xl border border-accent/20 bg-accent-soft p-4 space-y-3">
+                <div className="flex items-center gap-2 text-xs font-semibold text-primary">
+                  <Clock className="size-4 text-accent" />
+                  <span>
+                    Hay {waitlistTotal} persona{waitlistTotal === 1 ? '' : 's'} esperando un cupo
+                  </span>
+                </div>
+                <p className="text-sm text-foreground/80">
+                  ¿Quieres pasar a{' '}
+                  <strong className="text-primary">{firstWaitlistEntry.fullName}</strong>, el primero de
+                  la lista de espera, al grupo?
+                </p>
+                <div className="flex flex-col gap-2.5 pt-1">
+                  <Button
+                    variant="primary"
+                    onClick={() =>
+                      removeAttendeeMutation.mutate({
+                        attendeeId: attendeeToRemove.id,
+                        promoteFromWaitlist: true,
+                      })
+                    }
+                    disabled={removeAttendeeMutation.isPending}
+                    className="gap-2"
+                  >
+                    {removeAttendeeMutation.isPending ? (
+                      <Loader2 className="size-4 animate-spin" />
+                    ) : (
+                      <UserCheck className="size-4" />
+                    )}
+                    <span>Quitar y pasar a {firstWaitlistEntry.fullName} al grupo</span>
+                  </Button>
+                  <Button
+                    variant="outline"
+                    onClick={() =>
+                      removeAttendeeMutation.mutate({
+                        attendeeId: attendeeToRemove.id,
+                        promoteFromWaitlist: false,
+                      })
+                    }
+                    disabled={removeAttendeeMutation.isPending}
+                    className="gap-2"
+                  >
+                    {removeAttendeeMutation.isPending ? (
+                      <Loader2 className="size-4 animate-spin" />
+                    ) : (
+                      <UserMinus className="size-4" />
+                    )}
+                    <span>Solo quitar del grupo</span>
+                  </Button>
+                </div>
+              </div>
+            ) : (
+              <div className="flex items-center justify-end gap-2.5 pt-2 border-t border-border">
+                <Button variant="ghost" onClick={() => setAttendeeToRemove(null)}>
+                  Cancelar
+                </Button>
+                <Button
+                  variant="primary"
+                  onClick={() =>
+                    removeAttendeeMutation.mutate({
+                      attendeeId: attendeeToRemove.id,
+                      promoteFromWaitlist: false,
+                    })
+                  }
+                  disabled={removeAttendeeMutation.isPending}
+                  className="gap-2"
+                >
+                  {removeAttendeeMutation.isPending ? (
+                    <Loader2 className="size-4 animate-spin" />
+                  ) : (
+                    <Trash2 className="size-4" />
+                  )}
+                  <span>Quitar del grupo</span>
+                </Button>
+              </div>
+            )}
+          </div>
+        ) : null}
+      </Modal>
+      {/* MODAL: DETALLE LISTA DE ESPERA */}
+      <Modal
+        isOpen={selectedWaitlistEntry !== null}
+        onClose={() => setSelectedWaitlistEntry(null)}
+        title="Detalle de la lista de espera"
+        maxWidth="sm"
+      >
+        {selectedWaitlistEntry ? (
+          <div className="space-y-5">
+            {/* Header: avatar + name */}
+            <div className="flex items-center gap-3">
+              <div className="size-12 rounded-full bg-accent/10 text-accent font-bold flex items-center justify-center text-lg">
+                {selectedWaitlistEntry.fullName.charAt(0).toUpperCase()}
+              </div>
+              <div className="min-w-0">
+                <p className="text-lg font-semibold text-primary truncate">
+                  {selectedWaitlistEntry.fullName}
+                </p>
+                <p className="text-xs text-foreground/50">
+                  En espera desde el{' '}
+                  {new Date(selectedWaitlistEntry.createdAt).toLocaleDateString('es-ES', {
+                    day: 'numeric',
+                    month: 'long',
+                    year: 'numeric',
+                  })}
+                </p>
+              </div>
+            </div>
+
+            {/* Info rows */}
+            <div className="space-y-1 rounded-xl border border-border bg-primary-soft/30 divide-y divide-border">
+              <DetailRow icon={<Phone className="size-4 text-accent" />} label="Teléfono">
+                {selectedWaitlistEntry.phone ? (
+                  <div className="flex items-center gap-2">
+                    <span className="text-primary">{selectedWaitlistEntry.phone}</span>
+                    <a
+                      href={`https://wa.me/${selectedWaitlistEntry.phone.replace(/\D/g, '')}`}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      className="inline-flex items-center gap-1 text-xs font-medium text-success hover:text-success/80 transition-colors"
+                      onClick={(e) => e.stopPropagation()}
+                    >
+                      <MessageCircle className="size-3.5" />
+                      <span>WhatsApp</span>
+                    </a>
+                  </div>
+                ) : (
+                  <span className="text-foreground/40">Sin teléfono</span>
+                )}
+              </DetailRow>
+
+              {selectedWaitlistEntry.email ? (
+                <DetailRow icon={<Mail className="size-4 text-accent" />} label="Email">
+                  <a
+                    href={`mailto:${selectedWaitlistEntry.email}`}
+                    className="text-primary hover:text-accent transition-colors"
+                    onClick={(e) => e.stopPropagation()}
+                  >
+                    {selectedWaitlistEntry.email}
+                  </a>
+                </DetailRow>
+              ) : null}
+
+              <DetailRow icon={<StickyNote className="size-4 text-accent" />} label="Notas">
+                {selectedWaitlistEntry.notes ? (
+                  <span className="text-primary text-xs leading-relaxed">
+                    {selectedWaitlistEntry.notes}
+                  </span>
+                ) : (
+                  <span className="text-foreground/40">Sin notas</span>
+                )}
+              </DetailRow>
+            </div>
+
+            {/* Footer: status + actions */}
+            {!hasFreeCapacity ? (
+              <p className="rounded-xl border border-border bg-primary-soft/30 px-4 py-3 text-xs text-foreground/70">
+                El grupo alcanzó su cupo de miembros. Quita un miembro o aumenta el cupo para poder pasar
+                a esta persona al grupo.
+              </p>
+            ) : null}
+            <div className="grid grid-cols-1 gap-2.5 pt-2 border-t border-border">
+              <Button
+                variant="primary"
+                onClick={() => {
+                  const entry = selectedWaitlistEntry;
+                  setSelectedWaitlistEntry(null);
+                  promoteWaitlistMutation.mutate(entry.id);
+                }}
+                disabled={promoteWaitlistMutation.isPending || !hasFreeCapacity}
+                className="gap-2"
+              >
+                {promoteWaitlistMutation.isPending ? (
+                  <Loader2 className="size-4 animate-spin" />
+                ) : (
+                  <UserCheck className="size-4" />
+                )}
+                <span>Pasar al grupo</span>
+              </Button>
+              <Button
+                variant="ghost"
+                onClick={() => {
+                  const entry = selectedWaitlistEntry;
+                  setSelectedWaitlistEntry(null);
+                  removeWaitlistEntryMutation.mutate(entry);
+                }}
+                disabled={removeWaitlistEntryMutation.isPending}
+                className="gap-2 text-danger border border-danger/20 hover:bg-danger/10 hover:text-danger"
+              >
+                <Trash2 className="size-4" />
+                Quitar de la lista de espera
+              </Button>
+            </div>
           </div>
         ) : null}
       </Modal>