feat(mailEncrypt): add email encryption/decryption functions

- refactor email handling logic in handleEmailClick
- add new encryptEmail and decryptEmail utility functions
- improve error handling for decryption process
- simplify the email click handler implementation

lib/plugins/mailEncrypt.js

@@ -1,12 +1,21 @@
 export const handleEmailClick = (e, emailIcon, CONTACT_EMAIL) => {
   if (CONTACT_EMAIL && emailIcon && !emailIcon.current.href) {
     e.preventDefault()
-    try {
-      const email = decodeURIComponent(escape(atob(CONTACT_EMAIL)))
-      emailIcon.current.href = `mailto:${email}`
-      emailIcon.current.click()
-    } catch (error) {
-      console.error('解密邮箱失败:', error)
-    }
+    const email = decryptEmail(CONTACT_EMAIL)
+    emailIcon.current.href = `mailto:${email}`
+    emailIcon.current.click()
+  }
+}
+
+export const encryptEmail = email => {
+  return btoa(unescape(encodeURIComponent(email)))
+}
+
+export const decryptEmail = encryptedEmail => {
+  try {
+    return decodeURIComponent(escape(atob(encryptedEmail)))
+  } catch (error) {
+    console.error('解密邮箱失败:', error)
+    return encryptedEmail
   }
 }