fix(ssr): [tree-select] document is not defined (#17460)

packages/components/tree-select/src/cache-options.ts

@@ -1,5 +1,6 @@
 import { defineComponent, inject, watch } from 'vue'
 import { selectKey } from '@element-plus/components/select'
+import { isClient } from '@element-plus/utils'
 import type { SelectContext } from '@element-plus/components/select'
 import type { PropType } from 'vue'
 
@@ -33,6 +34,7 @@ export default defineComponent({
         // fork from packages/select/src/useSelect.ts#330
         const inputs = select.selectRef?.querySelectorAll('input') || []
         if (
+          isClient &&
           !Array.from(inputs).includes(
             document.activeElement as HTMLInputElement
           )