fix(tests): bypass MSW FormData hang in uploadPhotos tests 013 and 018

MSW's XHR interceptor calls request.arrayBuffer() on the FormData body
to emit upload progress events; this never resolves in jsdom+Node so the
XHR response is never dispatched and the tests time out. HttpResponse.error()
aborts before that code path runs, which is why test 017 already passed.

Replace the MSW handlers in 013 and 018 with vi.spyOn on journeyApi so
the store's state-management logic is tested without going through FormData
serialisation. Test 018 throws a 4xx-shaped error so isRetryable returns
false immediately, keeping the test instant.

client/src/store/journeyStore.test.ts

@@ -1,6 +1,7 @@
 // FE-STORE-JOURNEY-001 to FE-STORE-JOURNEY-015
 import { http, HttpResponse } from 'msw';
 import { server } from '../../tests/helpers/msw/server';
+import { journeyApi } from '../api/client';
 import { useJourneyStore } from './journeyStore';
 import type { JourneyDetail, JourneyEntry, JourneyPhoto } from './journeyStore';
 
@@ -282,11 +283,10 @@ describe('journeyStore', () => {
     useJourneyStore.setState({ current: detail });
 
     const newPhoto = buildPhoto({ id: 91, entry_id: 100 });
-    server.use(
-      http.post('/api/journeys/entries/100/photos', () =>
-        HttpResponse.json({ photos: [newPhoto] })
-      )
-    );
+    // MSW's XHR interceptor calls request.arrayBuffer() on FormData bodies to
+    // emit upload progress events, which hangs in jsdom+Node. Spy on the API
+    // layer directly so this test exercises store state management only.
+    const spy = vi.spyOn(journeyApi, 'uploadPhotos').mockResolvedValue({ photos: [newPhoto] } as any);
     const file = new File(['x'], 'photo.jpg', { type: 'image/jpeg' });
     const result = await useJourneyStore.getState().uploadPhotos(100, [file]);
     expect(result.succeeded).toHaveLength(1);
@@ -294,6 +294,7 @@ describe('journeyStore', () => {
     expect(result.failed).toHaveLength(0);
     const storedEntry = useJourneyStore.getState().current?.entries.find(e => e.id === 100);
     expect(storedEntry?.photos).toHaveLength(2);
+    spy.mockRestore();
   });
 
   it('FE-STORE-JOURNEY-017: uploadPhotos returns failed files and merges only succeeded on network error', async () => {
@@ -323,16 +324,15 @@ describe('journeyStore', () => {
     const photo1 = buildPhoto({ id: 91, entry_id: 100 });
     const photo2 = buildPhoto({ id: 92, entry_id: 100 });
     let callCount = 0;
-    server.use(
-      http.post('/api/journeys/entries/100/photos', () => {
-        callCount++;
-        if (callCount === 1) return HttpResponse.json({ photos: [photo1] });
-        return HttpResponse.error();
-      })
-    );
+    // Spy on the API layer to avoid MSW's FormData body hang (see FE-STORE-JOURNEY-013).
+    // Use a 4xx-shaped error for file2 so isRetryable returns false and the test runs instantly.
+    const spy = vi.spyOn(journeyApi, 'uploadPhotos').mockImplementation(async () => {
+      callCount++;
+      if (callCount === 1) return { photos: [photo1] } as any;
+      throw Object.assign(new Error('Bad Request'), { response: { status: 400 } });
+    });
     const file1 = new File(['a'], 'ok.jpg', { type: 'image/jpeg' });
     const file2 = new File(['b'], 'fail.jpg', { type: 'image/jpeg' });
-    // concurrency:1 so order is deterministic
     const result = await useJourneyStore.getState().uploadPhotos(100, [file1, file2], undefined);
     expect(result.succeeded).toHaveLength(1);
     expect(result.succeeded[0].id).toBe(photo1.id);
@@ -340,6 +340,7 @@ describe('journeyStore', () => {
     const storedEntry = useJourneyStore.getState().current?.entries.find(e => e.id === 100);
     expect(storedEntry?.photos).toHaveLength(1);
     void photo2; // referenced to avoid lint warning
+    spy.mockRestore();
   });
 
   // ── deletePhoto ──────────────────────────────────────────────────────────