fix: 修正重複註冊防呆邏輯

lib/PersonalInfo.dart

@@ -139,7 +139,6 @@ class _PersonalInfoState extends State<PersonalInfo> {
     } catch (e) {
       print('Error: $e');
     } finally {
-      await conn.close();
       await conn.close();
       print('finally儲存更新狀態:$_isEditing');
     }

lib/RegisterPage.dart

@@ -176,15 +176,16 @@ class _RegisterPageState extends State<RegisterPage> {
       String password = _passwordController.text;
 
       var result = await conn.execute(
-        'SELECT * FROM HomeLogin WHERE homeEmail = :email AND homePassword = :password',
-        {'email': email, 'password': password},
+        'SELECT * FROM HomeLogin WHERE homeEmail = :email',
+        {'email': email},
       );
 
       if (result.rows.isNotEmpty) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('登入失敗：帳號或密碼錯誤')),
+          SnackBar(content: Text('註冊失敗：電子信箱已被使用，請嘗試更換電子信箱')),
         );
       } else {
+        // TODO: Phone Address is setting not null in database, remove it or setting default value
         await conn.execute(
           'INSERT INTO HomeLogin (homeName, homeEmail, homePassword) VALUES (:name, :email, :password)',
           {'name': name, 'email': email, 'password': password},