feat: 报销预审会话状态管理与工作台交互增强

- 新增差旅报销会话状态管理与对话模型重构
- 增强风险观测服务与运行时聊天上下文作用域
- 优化工作台图标资源、助理意图识别与摘要工具
- 完善报销创建视图样式与差旅详情页标准调整交互
- 补充风险观测、运行时聊天与报销端点测试覆盖

web/src/views/scripts/useStewardPlanFlow.js

@@ -0,0 +1,158 @@
+import {
+  buildStewardPlanMessageText,
+  buildStewardPlanRequest,
+  buildStewardSuggestedActions,
+  normalizeStewardPlan
+} from './stewardPlanModel.js'
+import { SESSION_TYPE_STEWARD } from './travelReimbursementConversationModel.js'
+
+export function useStewardPlanFlow({
+  activeSessionType,
+  attachedFiles,
+  composerDraft,
+  currentUser,
+  fileInputRef,
+  messages,
+  createMessage,
+  fetchStewardPlan,
+  fetchStewardPlanStream,
+  nextTick,
+  persistSessionState,
+  replaceMessage,
+  scrollToBottom,
+  adjustComposerTextareaHeight,
+  submitting,
+  reviewActionBusy,
+  sessionSwitchBusy,
+  toast
+}) {
+  function isStewardSession() {
+    return String(activeSessionType.value || '').trim() === SESSION_TYPE_STEWARD
+  }
+
+  function clearStewardThinkingTimers() {
+    // 保留给页面卸载调用；流式版不再使用前端延时器。
+  }
+
+  async function submitStewardPlan(options = {}) {
+    if (!isStewardSession()) return false
+    if (submitting.value || reviewActionBusy.value || sessionSwitchBusy.value) return true
+
+    const rawText = String(options.rawText ?? composerDraft.value ?? '').trim()
+    const files = Array.from(options.files ?? attachedFiles.value ?? [])
+    if (!rawText && !files.length) return true
+
+    const fileNames = files.map((file) => file.name).filter(Boolean)
+    const userText = String(options.userText || rawText || `我上传了 ${fileNames.length} 份附件，请小财管家先归集任务。`).trim()
+    submitting.value = true
+
+    if (!options.skipUserMessage) {
+      messages.value.push(createMessage('user', userText, fileNames))
+    }
+    const pendingPlan = normalizeStewardPlan({
+      plan_status: 'streaming',
+      summary: '',
+      thinking_events: []
+    })
+    const pendingMessage = createMessage('assistant', '', [], {
+      assistantName: '小财管家',
+      meta: ['小财管家', '流式分析中'],
+      stewardPlan: {
+        ...pendingPlan,
+        streamStatus: 'streaming'
+      }
+    })
+    messages.value.push(pendingMessage)
+    composerDraft.value = ''
+    nextTick(() => {
+      adjustComposerTextareaHeight()
+      scrollToBottom()
+    })
+
+    try {
+      const requestPayload = buildStewardPlanRequest({
+        rawText,
+        files,
+        currentUser: currentUser.value || {}
+      })
+      const plan = await fetchPlanWithStreaming(pendingMessage.id, requestPayload)
+      const normalizedPlan = normalizeStewardPlan(plan, {
+        visibleThinkingEventCount: Number.MAX_SAFE_INTEGER
+      })
+      replaceMessage(pendingMessage.id, createMessage('assistant', buildStewardPlanMessageText(plan), [], {
+        assistantName: '小财管家',
+        meta: ['小财管家', '等待确认'],
+        stewardPlan: {
+          ...normalizedPlan,
+          streamStatus: 'completed'
+        },
+        suggestedActions: buildStewardSuggestedActions(plan)
+      }))
+      persistSessionState()
+      nextTick(scrollToBottom)
+    } catch (error) {
+      replaceMessage(pendingMessage.id, createMessage('assistant', error?.message || '小财管家规划失败，请稍后重试。', [], {
+        assistantName: '小财管家',
+        meta: ['小财管家', '规划失败']
+      }))
+      toast(error?.message || '小财管家规划失败，请稍后重试。')
+      persistSessionState()
+    } finally {
+      submitting.value = false
+      if (fileInputRef.value) {
+        fileInputRef.value.value = ''
+      }
+      nextTick(() => {
+        adjustComposerTextareaHeight()
+        scrollToBottom()
+      })
+    }
+    return true
+  }
+
+  function fetchPlanWithStreaming(messageId, requestPayload) {
+    if (typeof fetchStewardPlanStream === 'function') {
+      return fetchStewardPlanStream(requestPayload, {
+        onEvent: (event) => handleStreamEvent(messageId, event)
+      }, {
+        timeoutMs: 20000,
+        timeoutMessage: '小财管家任务规划超时，请稍后重试。'
+      })
+    }
+
+    return fetchStewardPlan(requestPayload, {
+      timeoutMs: 16000,
+      timeoutMessage: '小财管家任务规划超时，请稍后重试。'
+    })
+  }
+
+  function handleStreamEvent(messageId, event) {
+    if (event.event !== 'thinking') {
+      return
+    }
+    const message = messages.value.find((item) => item.id === messageId)
+    if (!message?.stewardPlan) return
+    const existingEvents = Array.isArray(message.stewardPlan.thinkingEvents)
+      ? message.stewardPlan.thinkingEvents
+      : []
+    const normalizedPlan = normalizeStewardPlan({
+      ...message.stewardPlan,
+      thinking_events: [...existingEvents, event.data]
+    }, {
+      visibleThinkingEventCount: existingEvents.length + 1
+    })
+    message.stewardPlan = {
+      ...message.stewardPlan,
+      ...normalizedPlan,
+      streamStatus: 'streaming'
+    }
+    persistSessionState()
+    nextTick(scrollToBottom)
+  }
+
+  return {
+    isStewardSession,
+    submitStewardPlan,
+    clearStewardThinkingTimers
+  }
+}