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/ai-workbench-conversation-store.test.mjs

@@ -0,0 +1,69 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import {
+  deleteAiWorkbenchConversation,
+  loadAiWorkbenchConversationHistory,
+  saveAiWorkbenchConversation
+} from '../src/utils/aiWorkbenchConversationStore.js'
+
+function installLocalStorageMock() {
+  const store = new Map()
+  globalThis.window = {
+    localStorage: {
+      getItem(key) {
+        return store.has(key) ? store.get(key) : null
+      },
+      setItem(key, value) {
+        store.set(key, String(value))
+      },
+      removeItem(key) {
+        store.delete(key)
+      },
+      clear() {
+        store.clear()
+      }
+    }
+  }
+  return store
+}
+
+test('AI workbench conversation store persists scoped history for sidebar sessions', () => {
+  installLocalStorageMock()
+  const user = { username: 'caoxiaozhu', email: 'caoxiaozhu@xf.com', name: '曹笑竹' }
+  const anotherUser = { username: 'budget-user' }
+
+  saveAiWorkbenchConversation(user, {
+    id: 'conv-first',
+    title: '',
+    updatedAt: Date.now() - 3000,
+    messages: [
+      { id: 'u1', role: 'user', content: '帮我核对差旅报销口径' },
+      { id: 'a1', role: 'assistant', content: '我会根据制度和票据要求继续核对。' }
+    ]
+  })
+  saveAiWorkbenchConversation(user, {
+    id: 'conv-second',
+    title: '预算占用分析',
+    updatedAt: Date.now(),
+    stewardState: { intent: 'budget_check' },
+    messages: [
+      { id: 'u2', role: 'user', content: '分析本月预算占用' },
+      { id: 'a2', role: 'assistant', content: '本月预算占用需要结合部门额度和已提交单据。' }
+    ]
+  })
+
+  const history = loadAiWorkbenchConversationHistory(user)
+  assert.equal(history.length, 2)
+  assert.equal(history[0].id, 'conv-second')
+  assert.equal(history[0].title, '预算占用分析')
+  assert.equal(history[0].stewardState.intent, 'budget_check')
+  assert.equal(history[1].title, '帮我核对差旅报销口径')
+  assert.equal(history[1].prompt, '帮我核对差旅报销口径')
+  assert.ok(history[0].time)
+  assert.deepEqual(loadAiWorkbenchConversationHistory(anotherUser), [])
+
+  const nextHistory = deleteAiWorkbenchConversation(user, 'conv-second')
+  assert.equal(nextHistory.length, 1)
+  assert.equal(nextHistory[0].id, 'conv-first')
+})