fix: 优化报销创建页面样式与洞察面板交互

修复侧边栏和审计视图样式细节，完善差旅报销洞察面板和消息
组件布局，优化报销创建页面会话管理和流程状态持久化，增强
申请预览工具函数和导航图标，补充单元测试。

web/src/components/travel/TravelReimbursementMessageItem.vue

@@ -76,7 +76,7 @@
           <EnterpriseSelect
             v-else-if="ui.isApplicationPreviewEditing(message, row.key)"
             v-model="ui.applicationPreviewEditor.draftValue"
-            class="application-preview-input application-preview-select"
+            class="application-preview-select"
             :options="ui.resolveApplicationPreviewEditorOptions(row.key)"
             clearable
             :teleported="false"
@@ -105,7 +105,27 @@
     </div>
 
     <div
-      v-if="message.role === 'assistant' && message.applicationPreview && ui.buildApplicationPreviewFooterText(message)"
+      v-if="message.role === 'assistant' && message.applicationPreview && ui.resolveApplicationPreviewMissingFields(message)?.length"
+      class="application-preview-footer application-preview-footer-missing"
+      aria-live="polite"
+    >
+      <span class="application-preview-missing-prefix">当前还需要补充：</span>
+      <span class="application-preview-missing-list">
+        <template
+          v-for="(field, index) in ui.resolveApplicationPreviewMissingFields(message)"
+          :key="`${message.id}-missing-${field}`"
+        >
+          <span class="application-preview-missing-chip">{{ field }}</span>
+          <span
+            v-if="index < ui.resolveApplicationPreviewMissingFields(message).length - 1"
+            class="application-preview-missing-separator"
+          >、</span>
+        </template>
+      </span>
+      <span class="application-preview-missing-suffix">。补齐后我再帮您提交申请。</span>
+    </div>
+    <div
+      v-else-if="message.role === 'assistant' && message.applicationPreview && ui.buildApplicationPreviewFooterText(message)"
       class="application-preview-footer message-answer-content message-answer-markdown"
       v-html="ui.renderMarkdown(ui.buildApplicationPreviewFooterText(message))"
       @click="ui.handleAssistantMarkdownClick($event, message)"