Use proper clipboard writing method

src/App.tsx

@@ -1,6 +1,7 @@
 import { useState, useEffect, useCallback } from 'react'
 import '@fontsource/lexend'
 import './App.css'
+import { writeText } from '@tauri-apps/plugin-clipboard-manager'
 
 function App () {
   const [password, setPassword] = useState('')
@@ -34,8 +35,9 @@ function App () {
     )
   }, [length, useUpper, useLower, useNumbers, useSymbols])
 
-  const copyToClipboard = () => {
-    navigator.clipboard.writeText(password)
+  const copyToClipboard = async () => {
+    if (password.trim().length == 0) return
+    await writeText(password)
     setCopied(true)
     setTimeout(() => setCopied(false), 1000)
   }