refactor(frontend): 优化公共组件

- 改进 EmptyState 和 LoadingState 组件
- 优化 CodeHighlight 样式和功能

frontend/src/components/common/EmptyState.vue

@@ -79,8 +79,6 @@ import {
   Inbox,
   AlertCircle,
   PackageOpen,
-  FolderOpen,
-  Database,
   Filter
 } from 'lucide-vue-next'
 import type { Component } from 'vue'
@@ -118,6 +116,11 @@ interface Emits {
 
 const props = withDefaults(defineProps<Props>(), {
   type: 'default',
+  icon: undefined,
+  title: undefined,
+  description: undefined,
+  actionText: undefined,
+  actionIcon: undefined,
   actionVariant: 'default',
   actionSize: 'default',
   size: 'md',

frontend/src/components/common/LoadingState.vue

@@ -48,6 +48,7 @@ interface Props {
 
 const props = withDefaults(defineProps<Props>(), {
   variant: 'spinner',
+  message: undefined,
   size: 'md',
   fullHeight: false,
 })