style(web): 统一后台图标与全局视觉

src/components/AppIcon/index.ts

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+// Author: fruit.com.cn
+
+import AppIcon from './src/AppIcon.vue'
+
+export { AppIcon }

src/components/AppIcon/src/AppIcon.vue

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+<!-- Author: fruit.com.cn -->
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import { Icon } from '@/components/Icon'
+import { normalizeAppIcon } from '@/constants/icons'
+import { propTypes } from '@/utils/propTypes'
+
+/**
+ * 后台统一图标入口：默认使用 Material Symbols Rounded。
+ */
+const props = defineProps({
+  icon: propTypes.string,
+  color: propTypes.string,
+  size: propTypes.number.def(18),
+  hoverColor: propTypes.string
+})
+
+const resolvedIcon = computed(() => normalizeAppIcon(props.icon))
+</script>
+
+<template>
+  <Icon
+    :icon="resolvedIcon"
+    :color="color"
+    :size="size"
+    :hover-color="hoverColor"
+    class="app-icon"
+  />
+</template>
+
+<style scoped>
+.app-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  line-height: 1;
+  vertical-align: middle;
+}
+</style>