feat: implement customizable funnel stages per tenant

- Modified attendances.funnel_stage in DB from ENUM to VARCHAR.

- Created tenant_funnels table and backend API routes to manage custom stages.

- Added /admin/funnels page for Admins/Managers to create, edit, order, and color-code their funnel stages.

- Updated Dashboard, UserDetail, and AttendanceDetail to fetch and render dynamic funnel stages instead of hardcoded enums.

- Added defensive checks and logging to GET /users/:idOrSlug to fix sporadic 500 errors during impersonation handoffs.

pages/UserDetail.tsx

@@ -1,7 +1,7 @@
 import React, { useEffect, useState, useMemo } from 'react';
 import { useParams, Link } from 'react-router-dom';
-import { getAttendances, getUserById } from '../services/dataService';
-import { Attendance, User, FunnelStage, DashboardFilter } from '../types';
+import { getAttendances, getUserById, getFunnels } from '../services/dataService';
+import { Attendance, User, FunnelStage, DashboardFilter, FunnelStageDef } from '../types';
 import { ArrowLeft, Mail, Phone, Clock, MessageSquare, ChevronLeft, ChevronRight, Eye, Filter } from 'lucide-react';
 import { DateRangePicker } from '../components/DateRangePicker';
 
@@ -11,6 +11,7 @@ export const UserDetail: React.FC = () => {
   const { id } = useParams<{ id: string }>();
   const [user, setUser] = useState<User | undefined>();
   const [attendances, setAttendances] = useState<Attendance[]>([]);
+  const [funnelDefs, setFunnelDefs] = useState<FunnelStageDef[]>([]);
   const [loading, setLoading] = useState(true);
   const [currentPage, setCurrentPage] = useState(1);
   const [filters, setFilters] = useState<DashboardFilter>({
@@ -31,11 +32,15 @@ export const UserDetail: React.FC = () => {
           setUser(u);
           
           if (u && tenantId) {
-            const data = await getAttendances(tenantId, { 
-              ...filters,
-              userId: id
-            });
+            const [data, funnels] = await Promise.all([
+              getAttendances(tenantId, { 
+                ...filters,
+                userId: id
+              }),
+              getFunnels(tenantId)
+            ]);
             setAttendances(data);
+            setFunnelDefs(funnels);
           }
         } catch (error) {
           console.error("Error loading user details", error);
@@ -66,7 +71,10 @@ export const UserDetail: React.FC = () => {
     }
   };
 
-  const getStageBadgeColor = (stage: FunnelStage) => {
+  const getStageBadgeColor = (stage: string) => {
+    const def = funnelDefs.find(f => f.name === stage);
+    if (def) return def.color_class;
+
     switch (stage) {
       case FunnelStage.WON: return 'bg-green-100 text-green-700 border-green-200 dark:bg-green-900/30 dark:text-green-400 dark:border-green-800';
       case FunnelStage.LOST: return 'bg-red-100 text-red-700 border-red-200 dark:bg-red-900/30 dark:text-red-400 dark:border-red-800';
@@ -127,17 +135,18 @@ export const UserDetail: React.FC = () => {
           onChange={(range) => handleFilterChange('dateRange', range)} 
         />
 
-        <select 
+        <select
           className="bg-zinc-50 dark:bg-dark-bg border border-zinc-200 dark:border-dark-border px-3 py-2 rounded-lg text-sm text-zinc-700 dark:text-zinc-200 outline-none focus:ring-2 focus:ring-brand-yellow/20 cursor-pointer hover:border-zinc-300 dark:hover:border-zinc-700 transition-all"
           value={filters.funnelStage}
           onChange={(e) => handleFilterChange('funnelStage', e.target.value)}
         >
           <option value="all">Todas Etapas</option>
-          {Object.values(FunnelStage).map(stage => (
+          {funnelDefs.length > 0 ? funnelDefs.map(stage => (
+            <option key={stage.id} value={stage.name}>{stage.name}</option>
+          )) : Object.values(FunnelStage).map(stage => (
             <option key={stage} value={stage}>{stage}</option>
           ))}
         </select>
-
         <select 
           className="bg-zinc-50 dark:bg-dark-bg border border-zinc-200 dark:border-dark-border px-3 py-2 rounded-lg text-sm text-zinc-700 dark:text-zinc-200 outline-none focus:ring-2 focus:ring-brand-yellow/20 cursor-pointer hover:border-zinc-300 dark:hover:border-zinc-700 transition-all"
           value={filters.origin}