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/tests/workbench-ai-application-context-submit.test.mjs

@@ -19,7 +19,7 @@ function createInlineMessage(role, content, options = {}) {
   }
 }
 
-function buildApplicationPreviewFlowHarness(messages) {
+function buildApplicationPreviewFlowHarness(messages, options = {}) {
   const conversationMessages = createRef(messages)
   const applicationSubmitConfirmOpen = createRef(false)
   const applicationSubmitConfirmContext = createRef(null)
@@ -69,7 +69,8 @@ function buildApplicationPreviewFlowHarness(messages) {
     resolveLatestInlineUserPrompt: () => '2026-02-20 至 2026-02-23，去上海出差，交通火车，保存草稿',
     scrollInlineConversationToBottom: () => {},
     sending: createRef(false),
-    toast: () => {}
+    toast: () => {},
+    onApplicationActionCompleted: options.onApplicationActionCompleted
   })
 
   return {
@@ -80,6 +81,72 @@ function buildApplicationPreviewFlowHarness(messages) {
   }
 }
 
+test('workbench auto-saved application draft continues remaining steward task', async () => {
+  const originalFetch = globalThis.fetch
+  const requests = []
+  globalThis.fetch = async (url, options = {}) => {
+    const normalizedUrl = String(url)
+    if (normalizedUrl.includes('/reimbursements/application-preview-action')) {
+      const body = JSON.parse(String(options.body || '{}'))
+      requests.push({ url: normalizedUrl, body })
+      return {
+        ok: true,
+        async json() {
+          return {
+            status: 'succeeded',
+            result: {
+              draft_payload: {
+                claim_id: 'claim-auto-saved-draft',
+                claim_no: 'AEW2DDAFL',
+                status: 'draft'
+              }
+            }
+          }
+        }
+      }
+    }
+    throw new Error(`unexpected request: ${normalizedUrl}`)
+  }
+
+  try {
+    const continuedTasks = []
+    const remainingTasks = [{
+      task_id: 'task-reimbursement-2',
+      task_type: 'reimbursement',
+      assigned_agent: 'reimbursement_assistant',
+      summary: '报销昨天的业务招待费 2000 元',
+      ontology_fields: {
+        expense_type: 'entertainment',
+        amount: '2000元',
+        time_range: '2026-06-25',
+        reason: '业务招待费报销'
+      }
+    }]
+    const harness = buildApplicationPreviewFlowHarness([], {
+      onApplicationActionCompleted: (tasks, sourceMessage) => {
+        continuedTasks.push({ tasks, sourceMessage })
+      }
+    })
+
+    await harness.flow.startAiApplicationPreview('travel', '差旅费', '2月20-23日去上海出差3天，服务国网服务器部署，并且报销昨天的业务招待费2000元', {
+      autoSaveDraft: true,
+      stewardRemainingTasks: remainingTasks,
+      onApplicationActionCompleted: (tasks, sourceMessage) => {
+        continuedTasks.push({ tasks, sourceMessage, fromOptions: true })
+      }
+    })
+
+    assert.equal(requests.length, 1)
+    assert.equal(continuedTasks.length, 1)
+    assert.deepEqual(continuedTasks[0].tasks, remainingTasks)
+    assert.equal(continuedTasks[0].sourceMessage.stewardRemainingTasks, remainingTasks)
+    assert.equal(continuedTasks[0].fromOptions, true)
+    assert.doesNotMatch(harness.conversationMessages.value.at(-1).content, /继续处理费用报销/)
+  } finally {
+    globalThis.fetch = originalFetch
+  }
+})
+
 test('workbench saved application draft can be submitted by contextual text without re-planning', async () => {
   const originalFetch = globalThis.fetch
   const requests = []