fix(useClipboard): use defaultWindow instead of window for SSR safety

The focus event listener was directly referencing `window`, which throws
ReferenceError in SSR environments. Use `defaultWindow` which safely
returns undefined in non-browser contexts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: childrentime

packages/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@reactuses/core",
-  "version": "6.3.0",
+  "version": "6.3.1",
   "description": "Collection of 100+ essential React Hooks with TypeScript support, tree-shaking, and SSR compatibility. Sensors, browser APIs, state management, animations, and more.",
   "license": "Unlicense",
   "homepage": "https://www.reactuse.com/",

packages/core/src/useClipboard/index.ts

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useState } from 'react'
 import { useEventListener } from '../useEventListener'
+import { defaultWindow } from '../utils/browser'
 import type { UseClipboard } from './interface'
 
 export const useClipboard: UseClipboard = (): readonly [
@@ -28,7 +29,7 @@ export const useClipboard: UseClipboard = (): readonly [
   useEventListener('cut', updateText)
 
   // Also listen for focus events to update clipboard when window regains focus
-  useEventListener('focus', updateText, window)
+  useEventListener('focus', updateText, defaultWindow)
 
   const copy = useCallback(async (txt: string) => {
     setText(txt)