feat: 新增修改資料密碼顯示按鈕

lib/PersonalInfo.dart

@@ -253,6 +253,20 @@ class _PersonalInfoState extends State<PersonalInfo> {
                   subtitle: _isEditing
                       ? TextField(
                           controller: _passwordController,
+                          obscureText: _passwordNotVisible,
+                          decoration: InputDecoration(
+                              suffixIcon: IconButton(
+                            icon: Icon(_passwordNotVisible
+                                ? Icons.visibility
+                                : Icons.visibility_off),
+                            onPressed: () {
+                              setState(
+                                () {
+                                  _passwordNotVisible = !_passwordNotVisible;
+                                },
+                              );
+                            },
+                          )),
                           onChanged: (value) {
                             setState(() {
                               _password = value;