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/workbenchAiIntentPlannerModel.js

@@ -143,13 +143,37 @@ function normalizeServerApplicationSteps(rawSteps = []) {
   return [...new Set(mappedSteps)]
 }
 
+function resolveModelTasks(rawPlan = {}) {
+  return Array.isArray(rawPlan?.tasks) ? rawPlan.tasks : []
+}
+
+function isModelTravelApplicationTask(task = {}) {
+  if (!task || typeof task !== 'object') {
+    return false
+  }
+  const taskType = String(task?.task_type || task?.taskType || '').trim()
+  const assignedAgent = String(task?.assigned_agent || task?.assignedAgent || '').trim()
+  return taskType === 'expense_application' || assignedAgent === 'application_assistant'
+}
+
 function findModelTravelApplicationTask(rawPlan = {}) {
-  const tasks = Array.isArray(rawPlan?.tasks) ? rawPlan.tasks : []
-  return tasks.find((task) => {
+  return resolveModelTasks(rawPlan).find(isModelTravelApplicationTask) || null
+}
+
+function resolveModelRemainingTasks(rawPlan = {}, selectedTask = null) {
+  const tasks = resolveModelTasks(rawPlan)
+  const selectedIndex = tasks.findIndex((task) => task === selectedTask)
+  if (selectedIndex < 0) {
+    return []
+  }
+  return tasks.slice(selectedIndex + 1).filter((task) => {
+    if (!task || typeof task !== 'object') {
+      return false
+    }
     const taskType = String(task?.task_type || task?.taskType || '').trim()
     const assignedAgent = String(task?.assigned_agent || task?.assignedAgent || '').trim()
-    return taskType === 'expense_application' || assignedAgent === 'application_assistant'
-  }) || null
+    return Boolean(taskType || assignedAgent)
+  })
 }
 
 function resolveCandidateFlows(rawPlan = {}) {
@@ -211,7 +235,7 @@ export function normalizeWorkbenchAiIntentPlan(rawPlan = {}, options = {}) {
     task.requested_action ||
       task.requestedAction ||
       rawPlan.requested_action ||
-    rawPlan.requestedAction ||
+      rawPlan.requestedAction ||
       ''
   ).trim() || normalizePromptAction(prompt)
   const serverSteps = normalizeServerApplicationSteps(task.action_steps || task.actionSteps)
@@ -226,7 +250,8 @@ export function normalizeWorkbenchAiIntentPlan(rawPlan = {}, options = {}) {
     missingFields: Array.isArray(task.missing_fields || task.missingFields)
       ? task.missing_fields || task.missingFields
       : [],
-    steps: serverSteps.length ? serverSteps : buildApplicationSteps(requestedAction)
+    steps: serverSteps.length ? serverSteps : buildApplicationSteps(requestedAction),
+    stewardRemainingTasks: resolveModelRemainingTasks(rawPlan, task)
   }
 }
 
@@ -275,7 +300,7 @@ export function resolveExecutableTravelApplicationPlan(plan = null) {
     return null
   }
   const requestedSubmit = plan.steps.includes(WORKBENCH_AI_STEP_SUBMIT_APPLICATION)
-  return {
+  const request = {
     expenseType: 'travel',
     expenseTypeLabel: '差旅费',
     sourceText: String(plan.sourceText || '').trim(),
@@ -285,6 +310,11 @@ export function resolveExecutableTravelApplicationPlan(plan = null) {
     requestedSubmit,
     submitRequiresConfirmation: requestedSubmit
   }
+  const stewardRemainingTasks = Array.isArray(plan.stewardRemainingTasks) ? plan.stewardRemainingTasks : []
+  if (stewardRemainingTasks.length) {
+    request.stewardRemainingTasks = stewardRemainingTasks
+  }
+  return request
 }
 
 export function isLowConfidenceTravelApplicationPlan(plan = null) {