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/composables/workbenchAiMode/useWorkbenchAiApplicationPreviewFlow.js

@@ -85,7 +85,8 @@ export function useWorkbenchAiApplicationPreviewFlow({
   resolveLatestInlineUserPrompt,
   scrollInlineConversationToBottom,
   sending,
-  toast
+  toast,
+  onApplicationActionCompleted = null
 }) {
   function isApplicationPreviewEstimatePending(message = {}) {
     return Boolean(message?.applicationPreview && isApplicationPreviewEstimatePendingPreview(message.applicationPreview))
@@ -345,6 +346,9 @@ export function useWorkbenchAiApplicationPreviewFlow({
     const flowId = isApplication ? 'travel_application' : 'travel_reimbursement'
     const taskLabel = isApplication ? '出差申请' : '费用报销'
     const ontologyFields = nextTask.ontology_fields || nextTask.ontologyFields || {}
+    // 透传去掉当前 nextTask 之后的剩余 task 列表,保证 task2 完成后 task3 也能继续推进,
+    // 避免 3+ task 场景在 task2 处断链。
+    const furtherRemainingTasks = remainingTasks.slice(1)
     return {
       label: `继续处理${taskLabel}`,
       description: `接下来处理${taskLabel}：${String(nextTask.summary || nextTask.title || '').slice(0, 40)}`,
@@ -357,7 +361,8 @@ export function useWorkbenchAiApplicationPreviewFlow({
         expense_type: String(ontologyFields.expense_type || 'travel').trim() || 'travel',
         expense_type_label: String(ontologyFields.expense_type_label || '差旅费').trim() || '差旅费',
         ontology_fields: ontologyFields,
-        original_message: String(nextTask.summary || nextTask.title || `继续处理${taskLabel}`).trim()
+        original_message: String(nextTask.summary || nextTask.title || `继续处理${taskLabel}`).trim(),
+        steward_remaining_tasks: furtherRemainingTasks
       }
     }
   }
@@ -458,6 +463,12 @@ export function useWorkbenchAiApplicationPreviewFlow({
       targetMessage.suggestedActions = []
       const detailActions = buildInlineApplicationDetailAction(draftPayload)
       const nextTaskAction = buildApplicationPreviewNextTaskAction(targetMessage)
+      const shouldAutoContinueNextTask = Boolean(
+        nextTaskAction &&
+        typeof onApplicationActionCompleted === 'function' &&
+        Array.isArray(targetMessage.stewardRemainingTasks) &&
+        targetMessage.stewardRemainingTasks.length
+      )
       replaceInlineMessage(
         pendingMessage.id,
         createInlineMessage('assistant', buildInlineApplicationPreviewActionResultText(actionType, payload), {
@@ -466,11 +477,16 @@ export function useWorkbenchAiApplicationPreviewFlow({
             streamStatus: 'completed',
             thinkingEvents: completeInlineThinkingEvents(resolveInlineThinkingEvents(pendingMessage))
           },
-          suggestedActions: nextTaskAction ? [...detailActions, nextTaskAction] : detailActions
+          suggestedActions: shouldAutoContinueNextTask
+            ? detailActions
+            : (nextTaskAction ? [...detailActions, nextTaskAction] : detailActions)
         })
       )
       persistCurrentConversation()
       scrollInlineConversationToBottom({ force: inlineConversationAutoScrollPinned.value })
+      if (shouldAutoContinueNextTask) {
+        onApplicationActionCompleted(targetMessage.stewardRemainingTasks, targetMessage)
+      }
       return true
     } catch (error) {
       replaceInlineMessage(
@@ -599,6 +615,12 @@ export function useWorkbenchAiApplicationPreviewFlow({
           skipUserMessage: true,
           userText: options.userMessage || '保存草稿'
         })
+      } else if (
+        typeof options.onPreviewReadyForNextTask === 'function' &&
+        Array.isArray(previewMessage.stewardRemainingTasks) &&
+        previewMessage.stewardRemainingTasks.length
+      ) {
+        options.onPreviewReadyForNextTask(previewMessage.stewardRemainingTasks, previewMessage)
       }
     } catch (error) {
       replaceInlineMessage(pendingMessage.id, createInlineMessage('assistant', error?.message || '申请核对表生成失败，请稍后重试。', {