fix(web): 多 task 草稿自动保存后继续推进下一 task

useWorkbenchAiApplicationPreviewFlow 在自动保存草稿分支透传 onApplicationActionCompleted，
确保草稿/提交完成后仍能按 remaining tasks 推进，修复多 task 报销场景后续步骤不启动。
更新 application-context-submit/intent-planner-model 测试，补充 bug 日志与开发日志。

web/src/composables/workbenchAiMode/useWorkbenchAiApplicationPreviewFlow.js

@@ -463,9 +463,12 @@ export function useWorkbenchAiApplicationPreviewFlow({
       targetMessage.suggestedActions = []
       const detailActions = buildInlineApplicationDetailAction(draftPayload)
       const nextTaskAction = buildApplicationPreviewNextTaskAction(targetMessage)
+      const actionCompletedHandler = typeof options.onApplicationActionCompleted === 'function'
+        ? options.onApplicationActionCompleted
+        : onApplicationActionCompleted
       const shouldAutoContinueNextTask = Boolean(
         nextTaskAction &&
-        typeof onApplicationActionCompleted === 'function' &&
+        typeof actionCompletedHandler === 'function' &&
         Array.isArray(targetMessage.stewardRemainingTasks) &&
         targetMessage.stewardRemainingTasks.length
       )
@@ -485,7 +488,7 @@ export function useWorkbenchAiApplicationPreviewFlow({
       persistCurrentConversation()
       scrollInlineConversationToBottom({ force: inlineConversationAutoScrollPinned.value })
       if (shouldAutoContinueNextTask) {
-        onApplicationActionCompleted(targetMessage.stewardRemainingTasks, targetMessage)
+        actionCompletedHandler(targetMessage.stewardRemainingTasks, targetMessage)
       }
       return true
     } catch (error) {
@@ -613,7 +616,8 @@ export function useWorkbenchAiApplicationPreviewFlow({
       if (options.autoSaveDraft) {
         await executeInlineApplicationPreviewAction(AI_APPLICATION_ACTION_SAVE_DRAFT, previewMessage, {
           skipUserMessage: true,
-          userText: options.userMessage || '保存草稿'
+          userText: options.userMessage || '保存草稿',
+          onApplicationActionCompleted: options.onApplicationActionCompleted
         })
       } else if (
         typeof options.onPreviewReadyForNextTask === 'function' &&