refactor: scss全局变量重命名和样式优化

Former-commit-id: bcfe8165225eec6d4982726ee26720ee57ec38e2

src/layout/components/Sidebar/index.vue

@@ -8,7 +8,7 @@ import { useSettingsStore } from '@/store/modules/settings';
 import { usePermissionStore } from '@/store/modules/permission';
 import { useAppStore } from '@/store/modules/app';
 import { storeToRefs } from 'pinia';
-import variables from '@/styles/ts-variables.module.scss';
+import variables from '@/styles/variables.module.scss';
 
 const settingsStore = useSettingsStore();
 const permissionStore = usePermissionStore();