feat: implement complex selection flow

apps/frontend/src/features/login/login-page.tsx

@@ -1,7 +1,7 @@
 import { Button } from '@/components/ui/button';
 import { Field, FieldError, FieldLabel } from '@/components/ui/field';
 import { Input } from '@/components/ui/input';
-import { authClient } from '@/lib/api-client';
+import { apiClient, authClient } from '@/lib/api-client';
 import { useAuth } from '@/lib/auth';
 import { zodResolver } from '@hookform/resolvers/zod';
 import { Link, useNavigate } from '@tanstack/react-router';
@@ -38,12 +38,30 @@ export function LoginPage({ redirectTo = '/' }: LoginPageProps) {
     },
   });
 
+  async function handlePostLogin() {
+    const complexes = await apiClient.complexes.listMine();
+
+    if (complexes.length === 1) {
+      await apiClient.complexes.select({ complexId: complexes[0].id });
+      navigate({ to: redirectTo });
+    } else if (complexes.length > 1) {
+      const current = await apiClient.complexes.getCurrent();
+      if (current) {
+        navigate({ to: redirectTo });
+      } else {
+        navigate({ to: '/select-complex' });
+      }
+    } else {
+      await navigate({ to: redirectTo });
+    }
+  }
+
   const onSubmit = async (values: LoginForm) => {
     setSubmitError(null);
 
     try {
       await signInWithPassword(values);
-      await navigate({ to: redirectTo });
+      await handlePostLogin();
     } catch {
       setSubmitError('No pudimos iniciar sesión. Verificá tus credenciales.');
     }
@@ -55,9 +73,7 @@ export function LoginPage({ redirectTo = '/' }: LoginPageProps) {
     try {
       await authClient.signIn.social({
         provider: 'google',
-        callbackURL: redirectTo.startsWith('http')
-          ? redirectTo
-          : `${window.location.origin}${redirectTo}`,
+        callbackURL: `${window.location.origin}/auth-callback`,
       });
     } catch {
       setSubmitError('No pudimos iniciar sesión con Google.');