feat(web): 工作台 AI 模式与差旅/风险建议交互优化

- 新增 PersonalWorkbenchAiMode 组件、AI 侧边栏与 orb 机器人视觉资源
- 新增 aiApplicationDraftModel / aiExpenseDraftModel / aiWorkbenchConversationStore
  及业务准入 aiSidebarBusinessAccess，支撑 AI 模式下的申请与报销草稿
- 顶栏、侧边栏、工作台样式重构，适配 AI 模式切换与响应式布局
- 同步 steward plan/off_topic、差旅报销引导流、风险建议卡片等测试

web/src/utils/workbenchSummary.js

@@ -89,6 +89,22 @@ function padDatePart(value) {
   return String(value).padStart(2, '0')
 }
 
+function formatMonthKey(date) {
+  return `${date.getFullYear()}-${padDatePart(date.getMonth() + 1)}`
+}
+
+function formatMonthLabel(date) {
+  return `${date.getMonth() + 1}月`
+}
+
+function shiftMonth(date, offset) {
+  return new Date(date.getFullYear(), date.getMonth() + offset, 1)
+}
+
+function resolveMonthStart(date) {
+  return new Date(date.getFullYear(), date.getMonth(), 1)
+}
+
 function formatDateTimeLabel(value) {
   if (value instanceof Date) {
     return [
@@ -558,6 +574,55 @@ function buildExpenseOperationRows(todoItems, notifications, progressItems) {
     .slice(0, 8)
 }
 
+function buildMonthlyAmountMap(ownedRequests) {
+  const rows = new Map()
+
+  for (const request of ownedRequests) {
+    const date = toDate(resolveClaimDate(request))
+    if (!date) {
+      continue
+    }
+
+    const key = formatMonthKey(date)
+    rows.set(key, (rows.get(key) || 0) + parseNumber(request?.amount))
+  }
+
+  return rows
+}
+
+function resolveTrendAnchorDate(ownedRequests) {
+  const dates = ownedRequests
+    .map((request) => toDate(resolveClaimDate(request)))
+    .filter(Boolean)
+    .sort((left, right) => right.getTime() - left.getTime())
+
+  return resolveMonthStart(dates[0] || new Date())
+}
+
+function buildReimbursementTrendRows(ownedRequests) {
+  const monthlyAmountMap = buildMonthlyAmountMap(ownedRequests)
+  const anchor = resolveTrendAnchorDate(ownedRequests)
+
+  return Array.from({ length: 6 }, (_, index) => {
+    const month = shiftMonth(anchor, index - 5)
+    const previousMonth = shiftMonth(month, -12)
+    const key = formatMonthKey(month)
+    const previousKey = formatMonthKey(previousMonth)
+    const amount = monthlyAmountMap.get(key) || 0
+    const previousAmount = monthlyAmountMap.get(previousKey) || 0
+
+    return {
+      key,
+      label: formatMonthLabel(month),
+      amount,
+      amountLabel: formatCurrency(amount),
+      previousKey,
+      previousAmount,
+      previousAmountLabel: formatCurrency(previousAmount)
+    }
+  })
+}
+
 export function buildWorkbenchSummary(requests, currentUser) {
   const allRequests = Array.isArray(requests)
     ? requests
@@ -602,6 +667,7 @@ export function buildWorkbenchSummary(requests, currentUser) {
     highRiskCount,
     todoItems,
     progressItems,
+    reimbursementTrendRows: buildReimbursementTrendRows(ownedRequests),
     notifications,
     expenseStatsDetail,
     unreadNotificationCount: notifications.filter((item) => item.unread).length