fix: wrap auth views in AuthLayout and remove duplicate logo from PhoneLoginView

- admin_handlers: wrap PhoneLoginView, LoginView, RegisterView in AuthLayout
  so the gradient split panel / header renders correctly
- phone_login_view: remove standalone logo block (AuthLayout provides it)
  and remove unused phone_form_provider import

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/views/phone_login_view.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:prosapp_web_app/providers/auth_provider.dart';
-import 'package:prosapp_web_app/providers/phone_form_provider.dart';
 import 'package:prosapp_web_app/router/router.dart';
 import 'package:provider/provider.dart';
 
@@ -87,21 +86,6 @@ class _PhoneLoginViewState extends State<PhoneLoginView> {
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
-              // Logo
-              Image.asset('assets/images/logo_prosapp.png',
-                  width: 160,
-                  errorBuilder: (_, __, ___) => const Text(
-                    'ProsApp',
-                    style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold, color: Color(0xFF42A4EF)),
-                  )),
-              const SizedBox(height: 8),
-              const Text(
-                'Conecta con los mejores profesionales',
-                textAlign: TextAlign.center,
-                style: TextStyle(color: Colors.grey, fontSize: 13),
-              ),
-              const SizedBox(height: 40),
-
               if (!_codeSent) _buildPhoneForm() else _buildOtpForm(),
             ],
           ),