style: 全局 UI 主题皮肤重构与样式模块化

引入 Element Plus 主题定制和主题皮肤 composable，将全局
样式拆分为组件级独立 CSS 文件（侧边栏、顶栏、工作台等），
统一色彩变量和间距规范，重构所有视图和组件样式以适配新
主题系统，优化图表和知识图谱组件视觉表现，提取审计和差
旅报销相关子组件。

web/src/components/travel/TravelRequestApprovalDialog.vue

@@ -0,0 +1,62 @@
+<template>
+  <ConfirmDialog
+    :open="open"
+    :badge="badge"
+    badge-tone="info"
+    :title="title"
+    :description="description"
+    cancel-text="返回核对"
+    :confirm-text="confirmText"
+    :busy-text="busyText"
+    confirm-tone="primary"
+    confirm-icon="mdi mdi-check-circle-outline"
+    :busy="busy"
+    @close="emit('close')"
+    @confirm="emit('confirm')"
+  >
+    <div class="submit-confirm-summary" aria-label="领导审批通过摘要">
+      <div class="submit-confirm-row">
+        <span>单据编号</span>
+        <strong>{{ documentNo }}</strong>
+      </div>
+      <div class="submit-confirm-row">
+        <span>当前节点</span>
+        <strong>{{ node }}</strong>
+      </div>
+      <div class="submit-confirm-row">
+        <span>{{ summaryLabel }}</span>
+        <strong>{{ nextStage }}</strong>
+      </div>
+      <div class="submit-confirm-row">
+        <span>{{ opinionTitle }}</span>
+        <strong>{{ normalizedOpinion }}</strong>
+      </div>
+    </div>
+  </ConfirmDialog>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+
+import ConfirmDialog from '../shared/ConfirmDialog.vue'
+
+const props = defineProps({
+  open: { type: Boolean, required: true },
+  badge: { type: String, required: true },
+  title: { type: String, required: true },
+  description: { type: String, required: true },
+  confirmText: { type: String, required: true },
+  busyText: { type: String, required: true },
+  busy: { type: Boolean, required: true },
+  documentNo: { type: [String, Number], required: true },
+  node: { type: String, default: '' },
+  summaryLabel: { type: String, required: true },
+  nextStage: { type: String, required: true },
+  opinionTitle: { type: String, required: true },
+  opinion: { type: String, default: '' }
+})
+
+const emit = defineEmits(['close', 'confirm'])
+
+const normalizedOpinion = computed(() => props.opinion.trim() || '未填写')
+</script>