feat: improve layout shell, navigation composables and add UI assets

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/composables/useNavigation.js

@@ -11,20 +11,20 @@ export const navItems = [
     desc: '面向财务共享中心的审批、风控、SLA与自动化运营看板'
   },
   {
-    id: 'chat',
-    label: '审批中心',
-    navHint: 'AI 助手与单据处理',
-    icon: icons.message,
-    title: '单据管理中心',
-    desc: '管理出差申请、报销单据，AI 辅助发起申请与智能审核。'
+    id: 'requests',
+    label: '差旅申请/报销',
+    navHint: '差旅单据与发起申请',
+    icon: icons.list,
+    title: '差旅申请/报销',
+    desc: '查看员工差旅报销单据、跟踪进度、发起新申请'
   },
   {
-    id: 'requests',
-    label: '报销单',
-    navHint: '待审队列与风险处理',
-    icon: icons.list,
-    title: '报销申请队列',
-    desc: '按风险、补件状态和 AI 建议处理待审单据。'
+    id: 'chat',
+    label: 'AI助手',
+    navHint: '指标、趋势与行动建议',
+    icon: icons.message,
+    title: 'AI 财务助手',
+    desc: '问指标、看趋势、拿建议，辅助你处理当前报销运营工作'
   },
   {
     id: 'policies',

src/composables/useRequests.js

@@ -23,9 +23,10 @@ export function useRequests() {
         || (filters.risk === '高风险' && item.status === 'danger')
         || (filters.risk === '需解释' && item.status === 'warning')
         || (filters.risk === '低风险' && item.status === 'success')
-      const matchesRange = activeRange.value === '本月'
-        || (activeRange.value === '本周' && item.range !== '本月')
-        || (activeRange.value === '今日' && item.range === '今日')
+  const matchesRange = activeRange.value === 'custom'
+    || activeRange.value === '本月'
+    || (activeRange.value === '本周' && item.range !== '本月')
+    || (activeRange.value === '今日' && item.range === '今日')
       return matchesSearch && matchesEntity && matchesCategory && matchesRisk && matchesRange
     })
   })