Fix EventSource URLs missing /ppt-tool basePath

Add apiUrl() helper to apiFetch.ts for non-fetch URL construction.
Fixed 3 SSE streams: outlines, presentation, job progress.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/app/(presentation-generator)/generate/progress/page.tsx

@@ -23,6 +23,7 @@ import { toast } from "sonner";
 import { cn } from "@/lib/utils";
 import Wrapper from "@/components/Wrapper";
 import { WizardApi, JobStatus } from "../../services/api/wizard";
+import { apiUrl } from "@/lib/apiFetch";
 
 export default function WizardProgressPage() {
   const router = useRouter();
@@ -52,7 +53,7 @@ export default function WizardProgressPage() {
     if (!jobId) return;
 
     const connectSSE = () => {
-      const es = new EventSource(`/api/v1/ppt/jobs/${jobId}/stream`);
+      const es = new EventSource(apiUrl(`/api/v1/ppt/jobs/${jobId}/stream`));
       eventSourceRef.current = es;
 
       es.addEventListener("response", (event) => {

frontend/app/(presentation-generator)/outline/hooks/useOutlineStreaming.ts

@@ -4,6 +4,7 @@ import { toast } from "sonner";
 import { setOutlines } from "@/store/slices/presentationGeneration";
 import { jsonrepair } from "jsonrepair";
 import { RootState } from "@/store/store";
+import { apiUrl } from "@/lib/apiFetch";
 
 
 
@@ -29,7 +30,7 @@ export const useOutlineStreaming = (presentationId: string | null) => {
       setIsLoading(true)
       try {
         eventSource = new EventSource(
-          `/api/v1/ppt/outlines/stream/${presentationId}`
+          apiUrl(`/api/v1/ppt/outlines/stream/${presentationId}`)
         );
 
         eventSource.addEventListener("response", (event) => {

frontend/app/(presentation-generator)/presentation/hooks/usePresentationStreaming.ts

@@ -1,5 +1,6 @@
 import { useEffect, useRef } from "react";
 import { useDispatch } from "react-redux";
+import { apiUrl } from "@/lib/apiFetch";
 import {
   clearPresentationData,
   setPresentationData,
@@ -27,7 +28,7 @@ export const usePresentationStreaming = (
       dispatch(clearPresentationData());
 
       eventSource = new EventSource(
-        `/api/v1/ppt/presentation/stream/${presentationId}`
+        apiUrl(`/api/v1/ppt/presentation/stream/${presentationId}`)
       );
 
       eventSource.addEventListener("response", (event) => {

frontend/lib/apiFetch.ts

@@ -11,3 +11,8 @@ export function apiFetch(path: string, init?: RequestInit): Promise<Response> {
   const url = path.startsWith('/api/') ? `${BASE_PATH}${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;
+}