fix: set single shot for wifi OSD delay timer

Set m_delayShowWifiOSD timer as single shot to ensure it only triggers
once after timeout
This prevents the timer from firing repeatedly and causing multiple
OSD popups
The timer is used to delay showing WiFi OSD and should only execute its
slot once

Log: Fixed WiFi OSD potentially showing multiple times due to timer
configuration

Influence:
1. Test WiFi connection process to verify OSD appears only once
2. Check timer behavior when network state changes rapidly
3. Verify OSD display timing matches expected delay
4. Test under various network connection scenarios

fix: 设置 WiFi OSD 延迟定时器为单次触发

将 m_delayShowWifiOSD 定时器设置为单次触发，确保超时后只触发一次
防止定时器重复触发导致多个 OSD 弹窗出现
该定时器用于延迟显示 WiFi OSD，应只执行其槽函数一次

Log: 修复因定时器配置问题可能导致 WiFi OSD 多次显示的问题

Influence:
1. 测试 WiFi 连接过程，验证 OSD 只出现一次
2. 检查网络状态快速变化时的定时器行为
3. 验证 OSD 显示时间是否符合预期延迟
4. 在不同网络连接场景下进行测试

PMS: BUG-340961

Author: caixr23

network-service-plugin/src/session/networkstatehandler.cpp

@@ -63,6 +63,8 @@ NetworkStateHandler::NetworkStateHandler(QObject *parent)
     , m_delayShowWifiOSD(new QTimer(this))
     , m_resetWifiOSDEnableTimer(new QTimer(this))
 {
+    m_delayShowWifiOSD->setSingleShot(true);
+    m_resetWifiOSDEnableTimer->setSingleShot(true);
     connect(m_dbusService, &QDBusServiceWatcher::serviceRegistered, this, &NetworkStateHandler::init);
     connect(m_delayShowWifiOSD, &QTimer::timeout, this, &NetworkStateHandler::delayShowWifiOSD);
     connect(m_resetWifiOSDEnableTimer, &QTimer::timeout, this, &NetworkStateHandler::resetWifiOSDEnable);
@@ -744,7 +746,7 @@ void NetworkStateHandler::delayShowWifiOSD()
 
 void NetworkStateHandler::updateOSDTimer(int interval)
 {
-    if (interval < 60) {  // 确保interval不会导致负数
+    if (interval < 60) { // 确保interval不会导致负数
         interval = 60;
     }
     m_delayShowWifiOSD->setInterval(interval - 50);