diff --git a/GEMINI.md b/GEMINI.md
index 5a9e4d3..44940b4 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -26,3 +26,4 @@
 4. **Upload de Arquivos:** Proibido o uso de Base64 para envio de novos arquivos ao servidor. Use obrigatoriamente `FormData` e envie o objeto `File/Blob` para as rotas de API que integram com o MinIO.
 5. **Build & Deploy Stability:** O pipeline de deploy deve obrigatoriamente utilizar `runs-on: self-hosted` e compilar apenas a plataforma `linux/arm64` (sem emulação QEMU). A atualização da stack em produção deve ser automatizada via container transiente do Watchtower.
 6. **Express Compatibility**: Avoid using raw `/*` wildcards in Express 5 routes; use Regex paths (`/^\/route\/(.+)$/`) for compatibility with `path-to-regexp` v8.
+7. **Frontend Independence**: NEVER import files from `services/` or `server.js` directly into React components to prevent Node.js/SDK leakage (causes White Screen). Use `helpers.ts` for UI logic.
diff --git a/MEMORY.md b/MEMORY.md
index 529c381..6fb05bf 100644
--- a/MEMORY.md
+++ b/MEMORY.md
@@ -11,6 +11,7 @@
 - [x] Correção do Crash 404 no Portal: Injeção da pasta `src/services` no container de produção para permitir o import do `storage.js`.
 - [x] Correção das Imagens de Prova: Normalização das URLs nas questões de avaliações (Portal e Manager).
 - [x] Estabilização de CI/CD: Transição para `runs-on: self-hosted` (ARM64 nativo) eliminando lentidão e crashes do QEMU.
+- [x] Fix Tela Branca (Portal): Refatoração de `normalizePhotoUrl` para `helpers.ts` isolado, evitando vazamento de SDK de Backend no Navegador.
 - [ ] Próximo Passo: Verificar se o Watchtower sincronizou as imagens corretamente na produção.
 
 ### 💳 Módulo Financeiro (Portal do Aluno)
diff --git a/portal/src/components/Header.tsx b/portal/src/components/Header.tsx
index c9f64a6..1d94d0a 100644
--- a/portal/src/components/Header.tsx
+++ b/portal/src/components/Header.tsx
@@ -3,7 +3,7 @@ import { useTheme } from '../context/ThemeContext';
 import { Moon, Sun } from 'lucide-react';
 import { useLocation } from 'react-router-dom';
 import Notifications from './Notifications';
-import { normalizePhotoUrl } from '../services/storage';
+import { normalizePhotoUrl } from '../helpers';
 
 const pageTitles: Record<string, string> = {
   '/': 'Dashboard',
diff --git a/portal/src/components/Sidebar.tsx b/portal/src/components/Sidebar.tsx
index 17d39db..0162ee6 100644
--- a/portal/src/components/Sidebar.tsx
+++ b/portal/src/components/Sidebar.tsx
@@ -5,7 +5,7 @@ import {
   FileText, Award, User, LogOut, GraduationCap, X, Menu, ClipboardList
 } from 'lucide-react';
 import { useState, useEffect } from 'react';
-import { normalizePhotoUrl } from '../services/storage';
+import { normalizePhotoUrl } from '../helpers';
 
 const navItems = [
   { path: '/', label: 'Dashboard', icon: LayoutDashboard },
diff --git a/portal/src/helpers.ts b/portal/src/helpers.ts
new file mode 100644
index 0000000..0e68fa3
--- /dev/null
+++ b/portal/src/helpers.ts
@@ -0,0 +1,15 @@
+/**
+ * Helpers compartihados de UI
+ */
+export function normalizePhotoUrl(url) {
+  if (!url || typeof url !== 'string') return '';
+  if (url.startsWith('data:image')) return url;
+  if (url.startsWith('/storage/')) return url;
+  
+  try {
+    const match = url.match(/^https?:\/\/[^\/]+\/(.+)$/);
+    if (match) return `/storage/${match[1]}`;
+  } catch(e) {}
+  
+  return url;
+}
diff --git a/portal/src/pages/Avaliacoes.tsx b/portal/src/pages/Avaliacoes.tsx
index cfb9209..dd407c6 100644
--- a/portal/src/pages/Avaliacoes.tsx
+++ b/portal/src/pages/Avaliacoes.tsx
@@ -5,7 +5,7 @@ import {
   ClipboardList, Clock, ChevronLeft, ChevronRight, Send, CheckCircle2,
   XCircle, Award, AlertTriangle, Timer, ArrowLeft
 } from 'lucide-react';
-import { normalizePhotoUrl } from '../services/storage';
+import { normalizePhotoUrl } from '../helpers';
 
 // ==========================================
 // Exam Environment — Portal do Aluno