feat: Display a loading spinner during initial app load if no user session is stored, otherwise skip the loading state.

web/src/context/AppContext.tsx

@@ -61,7 +61,16 @@ const initialState: State = {
 const AppContext = createContext<AppContextValue | undefined>(undefined);
 
 export const AppProvider = ({ children }: { children: React.ReactNode }) => {
-  const [loading, setLoading] = useState(true);
+  // Se já há sessão guardada, não mostra loading (app aparece de imediato)
+  const hasStoredUser = Boolean((() => {
+    try {
+      const raw = localStorage.getItem('smart-agenda');
+      if (!raw) return false;
+      const parsed = JSON.parse(raw);
+      return parsed?.user != null;
+    } catch { return false; }
+  })());
+  const [loading, setLoading] = useState(!hasStoredUser);
   const [state, setState] = useState<State>(() => {
     const stored = storage.get<Partial<State> | null>('smart-agenda', null);
     const safeStored = stored && typeof stored === 'object' ? stored : {};
@@ -511,8 +520,13 @@ export const AppProvider = ({ children }: { children: React.ReactNode }) => {
     refreshShops,
   };
 
-  // Loading Shield evita quebra generalizada se o app renderizar sem BD disponível
-  if (loading) return null;
+  // Loading Shield — mostra spinner enquanto autentica pela primeira vez
+  if (loading) return (
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', height: '100vh' }}>
+      <div style={{ width: 40, height: 40, border: '4px solid #e2e8f0', borderTopColor: '#6366f1', borderRadius: '50%', animation: 'spin 0.8s linear infinite' }} />
+      <style>{`@keyframes spin { to { transform: rotate(360deg); } }`}</style>
+    </div>
+  );
 
   return <AppContext.Provider value={value}>{children}</AppContext.Provider>;
 };