fix(nav): corrige sistema de navegação pós-login e sincronização de URL

Causa raiz do login não navegar: getCurrentRole() retornava null quando
vinculos.role era NULL no banco, fazendo isViewAllowed() retornar false
e handleNavigate() falhar silenciosamente sem nenhum feedback.

Fixes:
- backend.ts: getCurrentRole usa workspace?.role || 'paciente' para
  garantir que nunca retorne null/undefined
- App.tsx: onLoginSuccess usa setCurrentView+navigate diretamente,
  sem passar pela guarda de permissão (desnecessária pós-autenticação)
- App.tsx: mount effect sempre chama navigate(currentView) para sincronizar
  a URL com a view real — antes só executava com hash vazio, deixando
  /#/login na URL ao recarregar com usuário autenticado
- LoginView.tsx: remove spinner isInitializing de 3s que bloqueava o
  formulário em toda montagem do componente

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

frontend/App.tsx

@@ -210,11 +210,11 @@ const App: React.FC = () => {
     document.documentElement.style.setProperty('--brand-color-soft', `${clinColor}11`);
   }, [clinColor]);
 
-  // On mount: if there's no hash yet, write the current view into the URL
+  // On mount: always sync URL to match the actual current view.
+  // This handles auth redirects (e.g. reload at /#/login while authenticated shows dashboard
+  // but URL would stay /#/login without this call).
   useEffect(() => {
-    if (!window.location.hash || window.location.hash === '#update_db') {
-      navigate(currentView);
-    }
+    navigate(currentView);
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
@@ -244,7 +244,9 @@ const App: React.FC = () => {
       default:
         return <LoginView onLoginSuccess={() => {
           const role = HybridBackend.getCurrentRole();
-          handleNavigate(getDefaultViewForRole(role));
+          const view = getDefaultViewForRole(role);
+          setCurrentView(view);
+          navigate(view);
         }} />;
     }
   };

frontend/services/backend.ts

@@ -141,7 +141,7 @@ export const HybridBackend = {
 
   getCurrentRole: (): string => {
     const workspace = HybridBackend.getActiveWorkspace();
-    return workspace ? workspace.role : 'paciente';
+    return workspace?.role || 'paciente';
   },
 
   getDashboardStats: async () => {

frontend/views/LoginView.tsx

@@ -1,5 +1,5 @@
-import React, { useState, useEffect } from 'react';
-import { Database, Lock, User, ArrowRight, ShieldCheck, Loader2 } from 'lucide-react';
+import React, { useState } from 'react';
+import { Database, Lock, User, ArrowRight, ShieldCheck } from 'lucide-react';
 import { HybridBackend } from '../services/backend.ts';
 
 interface LoginViewProps {
@@ -11,12 +11,6 @@ export const LoginView: React.FC<LoginViewProps> = ({ onLoginSuccess }) => {
     const [password, setPassword] = useState('');
     const [loading, setLoading] = useState(false);
     const [error, setError] = useState('');
-    const [isInitializing, setIsInitializing] = useState(true);
-
-    useEffect(() => {
-        const timer = setTimeout(() => setIsInitializing(false), 3000);
-        return () => clearTimeout(timer);
-    }, []);
 
     const handleSubmit = async (e: React.FormEvent) => {
         e.preventDefault();
@@ -37,16 +31,6 @@ export const LoginView: React.FC<LoginViewProps> = ({ onLoginSuccess }) => {
         }
     };
 
-    if (isInitializing) {
-        return (
-            <div className="min-h-screen bg-gray-50 flex flex-col items-center justify-center p-4">
-                <Loader2 className="animate-spin text-blue-600 mb-4" size={48} />
-                <h2 className="text-gray-500 font-bold uppercase tracking-widest text-sm">Inicializando Sistema...</h2>
-                <span className="text-gray-400 text-xs mt-2 font-mono font-bold bg-gray-200 px-2 py-1 rounded">V1.0.2</span>
-            </div>
-        );
-    }
-
     return (
         <div className="min-h-screen bg-gray-50 flex items-center justify-center p-4">
             <div className="max-w-md w-full bg-white rounded-2xl shadow-xl overflow-hidden border border-gray-100">