fix: correct static file serving MIME types and add error handling to standard save

components/AdminStandards.tsx

@@ -92,17 +92,22 @@ export const AdminStandards: React.FC<AdminStandardsProps> = ({ apiKey, provider
       const parsed = JSON.parse(generatedJson);
       parsed.categoria_id = selectedCategory;
 
-      await fetch('/api/standards', {
+      const res = await fetch('/api/standards', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify(parsed)
       });
       
+      if (!res.ok) {
+        const errData = await res.json().catch(() => ({}));
+        throw new Error(errData.error || `Erro do servidor: ${res.status}`);
+      }
+      
       setGeneratedJson('');
       setStandardName('');
       fetchStandards(selectedCategory);
-    } catch (e) {
-      setJsonError("Erro ao salvar: JSON inválido ou falha na rede.");
+    } catch (e: any) {
+      setJsonError(e.message || "Erro ao salvar: JSON inválido ou falha na rede.");
     }
   };
 

server.js

@@ -219,7 +219,7 @@ const server = http.createServer((req, res) => {
   // --- END STANDARDS CRUD ---
 
   // Serve static files
-  let filePath = path.join(DIST_DIR, req.url === '/' ? 'index.html' : req.url);
+  let filePath = path.join(DIST_DIR, pathname === '/' ? 'index.html' : pathname);
   
   // If path doesn't exist, fallback to index.html (SPA routing)
   if (!fs.existsSync(filePath) || fs.statSync(filePath).isDirectory()) {