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/tests/workbench-summary.test.mjs

@@ -89,6 +89,52 @@ test('workbench summary builds real user notifications and progress from request
   assert.equal(summary.expenseStatsDetail.processingRows[0].stepCount, 5)
   assert.ok(summary.expenseStatsDetail.operationRows.some((item) => item.source === '待办'))
   assert.ok(summary.expenseStatsDetail.operationRows.some((item) => item.source === '进度'))
+  assert.ok(Array.isArray(summary.reimbursementTrendRows))
+  assert.equal(summary.reimbursementTrendRows.length, 6)
+  assert.equal(summary.reimbursementTrendRows.at(-1).key, '2026-06')
+  assert.equal(summary.reimbursementTrendRows.at(-1).amount, 1280)
+  assert.equal(summary.reimbursementTrendRows.at(-1).previousKey, '2025-06')
+})
+
+test('workbench reimbursement trend compares monthly totals with last year same period', () => {
+  const summary = buildWorkbenchSummary(
+    [
+      {
+        id: 'BX-202606',
+        claimNo: 'BX-202606',
+        person: currentUser.name,
+        title: '六月报销',
+        amount: 1280,
+        createdAt: '2026-06-15T10:00:00+08:00'
+      },
+      {
+        id: 'BX-202605',
+        claimNo: 'BX-202605',
+        person: currentUser.name,
+        title: '五月报销',
+        amount: 860,
+        createdAt: '2026-05-10T10:00:00+08:00'
+      },
+      {
+        id: 'BX-202506',
+        claimNo: 'BX-202506',
+        person: currentUser.name,
+        title: '去年六月报销',
+        amount: 920,
+        createdAt: '2025-06-12T10:00:00+08:00'
+      }
+    ],
+    currentUser
+  )
+
+  assert.deepEqual(
+    summary.reimbursementTrendRows.slice(-2).map((item) => item.label),
+    ['5月', '6月']
+  )
+  assert.equal(summary.reimbursementTrendRows.at(-2).amount, 860)
+  assert.equal(summary.reimbursementTrendRows.at(-2).previousAmount, 0)
+  assert.equal(summary.reimbursementTrendRows.at(-1).amount, 1280)
+  assert.equal(summary.reimbursementTrendRows.at(-1).previousAmount, 920)
 })
 
 test('workbench progress keeps application document type for AP claims', () => {