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/views/PersonalWorkbenchView.vue

@@ -1,20 +1,36 @@
 <template>
-  <PersonalWorkbench
-    :show-header="false"
-    :assistant-modal-open="assistantModalOpen"
-    :workbench-summary="workbenchSummary"
-    @open-assistant="emit('open-assistant', $event)"
-    @open-document="emit('open-document', $event)"
-  />
+  <Transition name="workbench-mode-fade" mode="out-in" appear>
+    <PersonalWorkbenchAiMode
+      v-if="workbenchMode === 'ai'"
+      key="ai"
+      :sidebar-command="aiSidebarCommand"
+      @conversation-change="emit('ai-conversation-change', $event)"
+      @conversation-history-change="emit('ai-conversation-history-change', $event)"
+    />
+    <PersonalWorkbench
+      v-else
+      key="traditional"
+      :show-header="false"
+      :assistant-modal-open="assistantModalOpen"
+      :workbench-summary="workbenchSummary"
+      @open-assistant="emit('open-assistant', $event)"
+      @open-document="emit('open-document', $event)"
+    />
+  </Transition>
 </template>
 
 <script setup>
+import PersonalWorkbenchAiMode from '../components/business/PersonalWorkbenchAiMode.vue'
 import PersonalWorkbench from '../components/business/PersonalWorkbench.vue'
 
 defineProps({
   assistantModalOpen: { type: Boolean, default: false },
-  workbenchSummary: { type: Object, default: () => ({}) }
+  workbenchSummary: { type: Object, default: () => ({}) },
+  workbenchMode: { type: String, default: 'traditional' },
+  aiSidebarCommand: { type: Object, default: () => ({ seq: 0, type: '', payload: null }) }
 })
 
-const emit = defineEmits(['open-assistant', 'open-document'])
+const emit = defineEmits(['open-assistant', 'open-document', 'ai-conversation-change', 'ai-conversation-history-change'])
 </script>
+
+<style scoped src="../assets/styles/views/personal-workbench-view.css"></style>