fix: support onUploadProgress in useUploadMediaMutation

SessionFormPage now passes { formData, onUploadProgress } to mutateAsync
for progress tracking. Update uploadMediaMutationFn to destructure the
object and forward onUploadProgress to apiUploadMedia; update apiUploadMedia
to accept and pass the callback to axios.

[batch-1-hotfix]

src/services/api/auth.js

@@ -46,5 +46,10 @@ export const apiGetRegistrationQuestionVideo = () =>
 // Media uploads (especially course videos) can legitimately take several
 // minutes on slower connections. Keep the normal API timeout short, but give
 // this endpoint enough time to complete the backend's 300 MB upload contract.
-export const apiUploadMedia = (formData) =>
-  http.post(endpoints.uploadMedia, formData, { timeout: 10 * 60 * 1000 })
+// `onUploadProgress` is optional and forwarded straight to axios so callers
+// can render an upload progress bar (e.g. XHR progress events).
+export const apiUploadMedia = (formData, onUploadProgress) =>
+  http.post(endpoints.uploadMedia, formData, {
+    timeout: 10 * 60 * 1000,
+    ...(onUploadProgress ? { onUploadProgress } : {}),
+  })