fix download path

frontend/app/(presentation-generator)/presentation/components/Header.tsx

@@ -17,7 +17,7 @@ import {
   PopoverTrigger,
 } from "@/components/ui/popover";
 import { PresentationGenerationApi } from "../../services/api/presentation-generation";
-import { apiFetch } from "@/lib/apiFetch";
+import { apiFetch, apiUrl } from "@/lib/apiFetch";
 import { OverlayLoader } from "@/components/ui/overlay-loader";
 import { useDispatch, useSelector } from "react-redux";
 
@@ -137,13 +137,14 @@ const Header = ({
     router.push(`/presentation?id=${presentation_id}&stream=true`);
   };
   const downloadLink = (path: string) => {
+    const url = apiUrl(path);
     // if we have popup access give direct download if not redirect to the path
     if (window.opener) {
-      window.open(path, '_blank');
+      window.open(url, '_blank');
     } else {
       const link = document.createElement('a');
-      link.href = path;
-      link.download = path.split('/').pop() || 'download';
+      link.href = url;
+      link.download = url.split('/').pop() || 'download';
       document.body.appendChild(link);
       link.click();
     }

frontend/lib/apiFetch.ts

@@ -7,12 +7,18 @@
  */
 const BASE_PATH = '/ppt-tool';
 
+const PREFIXED_PATHS = ['/api/', '/app_data/', '/static/'];
+
+function needsBasePath(path: string): boolean {
+  return PREFIXED_PATHS.some((p) => path.startsWith(p));
+}
+
 export function apiFetch(path: string, init?: RequestInit): Promise<Response> {
-  const url = path.startsWith('/api/') ? `${BASE_PATH}${path}` : path;
+  const url = needsBasePath(path) ? `${BASE_PATH}${path}` : path;
   return fetch(url, init);
 }
 
 /** Returns the full URL with basePath — use for EventSource and other non-fetch calls. */
 export function apiUrl(path: string): string {
-  return path.startsWith('/api/') ? `${BASE_PATH}${path}` : path;
+  return needsBasePath(path) ? `${BASE_PATH}${path}` : path;
 }