feat(web): AI 工作台多 task 串行推进与会话适配

- useWorkbenchAiApplicationPreviewFlow/useWorkbenchAiActionRouter/useWorkbenchAiCommandIntents 支持 task1 完成后自动推进 task2，确认按钮直接拉起申请预览，草稿/提交成功后继续推进下一 task
- workbenchAiIntentPlannerModel/workbenchAiMessageModel/workbenchAiCommandIntentModel 适配多 task 意图规划与消息结构
- aiApplicationPreviewActions/aiApplicationPrecheckModel/aiExpenseDraftModel/aiWorkbenchConversationStore 草稿与会话存储适配
- PersonalWorkbenchAiMode 与样式适配，更新 preview-actions/expense-draft/conversation-store/fast-preview/action-router/command-intent/intent-planner 测试

web/src/components/business/PersonalWorkbenchAiMode.vue

@@ -22,3 +22,9 @@ const {
 </script>
 
 <style scoped src="../../assets/styles/components/personal-workbench-ai-mode.css"></style>
+<style scoped>
+/* Force styling cache invalidation and hot update */
+.force-reload-css-cache-v1 {
+  display: block;
+}
+</style>