diff --git a/rsconcept/frontend/eslint.config.js b/rsconcept/frontend/eslint.config.js
index 7f38cb2f..c5229e22 100644
--- a/rsconcept/frontend/eslint.config.js
+++ b/rsconcept/frontend/eslint.config.js
@@ -72,7 +72,6 @@ export default [
     settings: { react: { version: 'detect' } },
     rules: {
       ...basicRules,
-      'react-refresh/only-export-components': ['off', { allowConstantExport: true }],
       'simple-import-sort/imports': [
         'warn',
         {
diff --git a/rsconcept/frontend/src/app/global-providers.tsx b/rsconcept/frontend/src/app/global-providers.tsx
index fa1c3d29..9b6c92f3 100644
--- a/rsconcept/frontend/src/app/global-providers.tsx
+++ b/rsconcept/frontend/src/app/global-providers.tsx
@@ -10,7 +10,7 @@ export function GlobalProviders({ children }: React.PropsWithChildren) {
   <IntlProvider locale='ru' defaultLocale='ru'>
   <QueryClientProvider client={queryClient}>
   
-    <ReactQueryDevtools initialIsOpen={false} />
+    {import.meta.env.DEV ? <ReactQueryDevtools initialIsOpen={false} /> : null}
     {children}
   
   </QueryClientProvider>
diff --git a/rsconcept/frontend/src/components/info-error.tsx b/rsconcept/frontend/src/components/info-error.tsx
index 3aaf8d48..7d893050 100644
--- a/rsconcept/frontend/src/components/info-error.tsx
+++ b/rsconcept/frontend/src/components/info-error.tsx
@@ -70,7 +70,9 @@ export function DescribeError({ error }: { error: ErrorData }) {
   let sanitizedHtml: string | null = null;
   if (isHtml) {
     sanitizedHtml = DOMPurify.sanitize(error.response.data as string, {
-      USE_PROFILES: { html: true }
+      USE_PROFILES: { html: true },
+      ALLOWED_TAGS: ['b', 'i', 'em', 'strong', 'ul', 'li', 'br'],
+      ALLOWED_ATTR: []
     });
   }
   return (
diff --git a/rsconcept/frontend/src/main.tsx b/rsconcept/frontend/src/main.tsx
index 8d0ec5b0..e3212551 100644
--- a/rsconcept/frontend/src/main.tsx
+++ b/rsconcept/frontend/src/main.tsx
@@ -5,7 +5,7 @@ import { App } from './app';
 
 import './index.css';
 
-if (typeof window !== 'undefined' && !!process.env.NODE_ENV && process.env.NODE_ENV === 'development') {
+if (typeof window !== 'undefined' && import.meta.env.DEV) {
   void import('react-scan').then(module =>
     module.scan({
       enabled: true
@@ -13,17 +13,19 @@ if (typeof window !== 'undefined' && !!process.env.NODE_ENV && process.env.NODE_
   );
 }
 
-window.addEventListener('error', (event: ErrorEvent) => {
-  const error = event.error as Error;
-  if (
-    error instanceof Error &&
-    typeof error.message === 'string' &&
-    error.message.includes('Failed to fetch dynamically imported module')
-  ) {
-    console.warn('Detected stale bundle — reloading...');
-    window.location.reload();
-  }
-});
+if (typeof window !== 'undefined') {
+  window.addEventListener('error', (event: ErrorEvent) => {
+    const error = event.error as Error;
+    if (
+      error instanceof Error &&
+      typeof error.message === 'string' &&
+      error.message.includes('Failed to fetch dynamically imported module')
+    ) {
+      console.warn('Detected stale bundle — reloading...');
+      window.location.reload();
+    }
+  });
+}
 
 createRoot(document.getElementById('root')!).render(
   <GlobalProviders>