feat: 风险可见性控制与差旅详情页交互优化

- 新增风险可见性工具函数与风险日趋势图表组件
- 优化差旅请求详情页费用模型与视图交互
- 完善顶部导航栏样式与应用壳路由逻辑
- 补充风险可见性、风险看板与差旅详情测试覆盖

web/src/scripts/App.js

@@ -21,6 +21,7 @@ import { useRequests } from '../composables/useRequests.js'
 import { useChat } from '../composables/useChat.js'
 import { useToast } from '../composables/useToast.js'
 import { documents } from '../data/requests.js'
+import { createCurrentYearDateRange } from '../utils/dateRangeDefaults.js'
 
 export default {
   name: 'App',
@@ -71,7 +72,7 @@ export default {
     const { toastText, toast } = useToast()
 
     const docSearch = ref('')
-    const customRange = ref({ start: '2024-07-06', end: '2024-07-12' })
+    const customRange = ref(createCurrentYearDateRange())
     const travelPrompts = ['帮我提交出差申请', '预订机票', '预订酒店', '预订火车票', '查询差旅政策']
 
     const topBarView = computed(() => {