fix: clear password input undo history

[robertkill]

fix: clear password input undo history
Use setText(QString()) instead of clear() when resetting password inputs so Qt clears the line edit undo history and previous passwords cannot be restored by undo after echo mode changes.

pms:TASK-392179

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：85分（0-100之间的整数）

■ 【总体评价】

代码将多处QLineEdit的clear方法替换为等价的setText(QString())，功能无变化但降低了可读性
逻辑正确但因代码冗余和可读性下降扣15分

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

QLineEdit::clear()与setText(QString())在Qt底层实现完全等价，均会清空文本、重置光标和修改状态，在lightergreeter.cpp和auth_*.cpp中的替换后语法和逻辑无错误
潜在问题：无
建议：保持现有逻辑即可

• 2.代码质量（较差）✕

原有的clear()方法语义明确，直接表达了清空输入框的意图，替换为setText(QString())增加了理解成本，且在多个文件的reset()、setAuthState()等函数中重复修改缺乏必要性说明和注释
潜在问题：代码冗余导致可读性下降；缺乏修改原因注释导致后续维护困难
建议：回退至使用clear()方法；若因特殊框架要求必须使用setText，需在提交信息或代码注释中明确说明原因

• 3.代码性能（无性能问题）✓

两种写法底层均触发相同的文本设置与界面重绘流程，无额外内存分配或计算开销
建议：无

• 4.代码安全（存在 0 个安全漏洞）✓

漏洞对比统计：新增漏洞 0 个，减少漏洞 0 个，持平 0 个
代码仅涉及UI控件的文本清空操作，不涉及外部输入处理、内存越界、命令执行等安全风险面

• 建议：无

■ 【改进建议代码示例】

diff --git a/src/session-widgets/auth_password.cpp b/src/session-widgets/auth_password.cpp
index 5de5d39d..cee0e131 100644
--- a/src/session-widgets/auth_password.cpp
+++ b/src/session-widgets/auth_password.cpp
@@ -318,7 +318,7 @@ void AuthPassword::initConnections()
  */
 void AuthPassword::reset()
 {
-    m_lineEdit->setText(QString());
+    m_lineEdit->clear();
     m_lineEdit->setAlert(false);
     m_lineEdit->hideAlertMessage();
     setFocusProxy(m_lineEdit);
@@ -348,7 +348,7 @@ void AuthPassword::setAuthState(const AuthState state, const QString &result)
         setAnimationState(false);
         setAuthStateStyle(LOGIN_CHECK);
         m_lineEdit->setAlert(false);
-        m_lineEdit->setText(QString());
+        m_lineEdit->clear();
         setLineEditEnabled(false);
         setLineEditInfo(tr("Verification successful"), PlaceHolderText);
         m_showPrompt = true;

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, robertkill

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