melhorias de performance

frontend/src/App.tsx

@@ -1,22 +1,30 @@
+import { lazy, Suspense } from "react";
 import { Route, Routes } from "react-router-dom";
 import { Layout } from "./components/Layout.js";
+
+// A página inicial (Atlas) já carrega o peso pesado de verdade (three.js +
+// r3f + drei) — separar as OUTRAS rotas em chunks à parte só evita que
+// quem abre o atlas baixe/parseie de graça o código do Quiz, de Planos e
+// do painel interno de estatísticas antes mesmo de ver o modelo 3D.
 import AtlasPage from "./routes/AtlasPage.js";
-import PlanesPage from "./routes/PlanesPage.js";
-import QuizPage from "./routes/QuizPage.js";
-import PhysicalExamPage from "./routes/PhysicalExamPage.js";
-import AdminStatsPage from "./routes/AdminStatsPage.js";
+const PlanesPage = lazy(() => import("./routes/PlanesPage.js"));
+const PhysicalExamPage = lazy(() => import("./routes/PhysicalExamPage.js"));
+const QuizPage = lazy(() => import("./routes/QuizPage.js"));
+const AdminStatsPage = lazy(() => import("./routes/AdminStatsPage.js"));
 
 export default function App() {
   return (
-    <Routes>
-      <Route element={<Layout />}>
-        <Route path="/" element={<AtlasPage />} />
-        <Route path="/planos-anatomicos" element={<PlanesPage />} />
-        <Route path="/exame-fisico" element={<PhysicalExamPage />} />
-        <Route path="/quiz" element={<QuizPage />} />
-      </Route>
-      {/* Fora do Layout: painel interno, sem o menu/nav do atlas. */}
-      <Route path="/estatisticas" element={<AdminStatsPage />} />
-    </Routes>
+    <Suspense fallback={null}>
+      <Routes>
+        <Route element={<Layout />}>
+          <Route path="/" element={<AtlasPage />} />
+          <Route path="/planos-anatomicos" element={<PlanesPage />} />
+          <Route path="/exame-fisico" element={<PhysicalExamPage />} />
+          <Route path="/quiz" element={<QuizPage />} />
+        </Route>
+        {/* Fora do Layout: painel interno, sem o menu/nav do atlas. */}
+        <Route path="/estatisticas" element={<AdminStatsPage />} />
+      </Routes>
+    </Suspense>
   );
 }