fix(ui): dialog default focus and IP display update

1. Default button focus:
   - Set focus to 'Switch' button (ipSwitchConfirmButton->setFocus())
   - Confirm button appears highlighted by default
   - Cancel button remains in default (gray) state
   - Pressing Enter will trigger the confirm action

2. IP display update after switch:
   - Call setIp(newIp) in confirm button handler
   - Updates ipValueLabel text to show new IP
   - Updates ipComboBox selection to match
   - Fixes issue where displayed IP didn't change after confirmation

Author: re2zero

src/lib/cooperation/core/gui/widgets/cooperationstatewidget.cpp

@@ -642,7 +642,7 @@ void BottomLabel::showSwitchConfirmDialog(const QString &newIp)
     connect(ipSwitchConfirmButton, &CooperationSuggestButton::clicked, ipSwitchDialog, [this, newIp, ipSwitchDialog] {
         CooperationUtil::setSelectedIp(newIp);
         Q_EMIT ipChanged(newIp);
-        currentSelectedIp = newIp;
+        setIp(newIp);
         ipSwitchDialog->accept();
     });
 
@@ -651,6 +651,8 @@ void BottomLabel::showSwitchConfirmDialog(const QString &newIp)
     ipSwitchButtonLayout->addWidget(ipSwitchConfirmButton);
     ipSwitchButtonLayout->addStretch();
 
+    ipSwitchConfirmButton->setFocus();
+
     ipSwitchLayout->addSpacing(15);
     ipSwitchLayout->addWidget(ipSwitchTitleLabel);
     ipSwitchLayout->addSpacing(10);