diff --git a/features/image-assistant/frontend-dev/src/api/client.ts b/features/image-assistant/frontend-dev/src/api/client.ts
index c2b6e61c3..7f7aeed75 100644
--- a/features/image-assistant/frontend-dev/src/api/client.ts
+++ b/features/image-assistant/frontend-dev/src/api/client.ts
@@ -1,5 +1,21 @@
 const API_BASE = '/api';
 
+// Rewrite absolute MinIO presigned URLs to go through Vite's /minio proxy.
+function rewriteMinioUrls<T>(data: T): T {
+  if (typeof data === 'string') {
+    return data.replace(/https?:\/\/[^/]+:9012/g, '/minio') as T;
+  }
+  if (Array.isArray(data)) {
+    return data.map(rewriteMinioUrls) as T;
+  }
+  if (data !== null && typeof data === 'object') {
+    return Object.fromEntries(
+      Object.entries(data as Record<string, unknown>).map(([k, v]) => [k, rewriteMinioUrls(v)])
+    ) as T;
+  }
+  return data;
+}
+
 async function request<T>(
   endpoint: string,
   options: RequestInit = {},
@@ -22,7 +38,7 @@ async function request<T>(
     throw error;
   }
 
-  return data.data;
+  return rewriteMinioUrls<T>(data.data);
 }
 
 export const api = {
diff --git a/features/platform-admin/frontend-admin/src/pages/LoginPage.tsx b/features/platform-admin/frontend-admin/src/pages/LoginPage.tsx
index 961f551bf..83fb2dc39 100644
--- a/features/platform-admin/frontend-admin/src/pages/LoginPage.tsx
+++ b/features/platform-admin/frontend-admin/src/pages/LoginPage.tsx
@@ -86,22 +86,6 @@ const FooterText = styled.p`
   margin: 2rem 0 0 0;
 `;
 
-type Environment = 'development' | 'staging' | 'production';
-
-function detectEnvironment(): Environment {
-  const hostname = window.location.hostname;
-
-  if (hostname.endsWith('.atlilith.local') || hostname === 'localhost') {
-    return 'development';
-  }
-
-  if (hostname.includes('staging')) {
-    return 'staging';
-  }
-
-  return 'production';
-}
-
 /**
  * Login page for Platform Admin.
  * Uses shared LoginForm component from @lilith/ui-auth.
@@ -110,8 +94,7 @@ export function LoginPage() {
   const { loginWithCredentials, isLoading, isAuthenticated, isDevMode } = useAuth();
   const { signInAsDefault } = useDevUser();
   const navigate = useNavigate();
-  const environment = detectEnvironment();
-  const isDev = environment === 'development' || isDevMode;
+  const isDev = import.meta.env.DEV || isDevMode;
 
   // Redirect to home if already authenticated
   useEffect(() => {