Import large activity Excel in the browser via JSON chunks to avoid 502.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/views/ActivitiesView.vue

@@ -20,6 +20,7 @@ import {
 } from '@/components/ui';
 import UiIcon from '@/components/UiIcon.vue';
 import ExcelImportFlow from '@/components/ExcelImportFlow.vue';
+import { ACTIVITY_EXCEL_ALIASES, ACTIVITY_EXCEL_FIELDS } from '@/lib/activity-excel';
 import ActivityFormView from '@/views/ActivityFormView.vue';
 import type {
   ActivityDto,
@@ -499,8 +500,10 @@ onUnmounted(() => {
         </UiButton>
         <ExcelImportFlow
           preview-path="/activities/import/preview"
-          prepare-path="/activities/import/prepare"
           import-path="/activities/import"
+          rows-import-path="/activities/import/rows"
+          :client-aliases="ACTIVITY_EXCEL_ALIASES"
+          :client-fields="ACTIVITY_EXCEL_FIELDS"
           :disabled="busy"
           @start="onImportStart"
           @done="onImportDone"