Add missing QQuickStyle::setStyle calls

Calls `QQuickStyle::setStyle("breeze")` everywhere we were
calling `QApplication::setStyle("org.kde.desktop")`.

kcm/CMakeLists.txt

@@ -11,6 +11,7 @@ target_link_libraries(kcm_kdeconnect
     Qt::Core
     Qt::Gui
     Qt::QuickWidgets
+    Qt::QuickControls2
     KF6::I18n
     KF6::KCMUtils
     kdeconnectinterfaces

kcm/kcm.cpp

@@ -16,6 +16,7 @@
 
 #include <QQmlContext>
 #include <QQuickItem>
+#include <QQuickStyle>
 
 #include "dbushelpers.h"
 #include "dbusinterfaces.h"
@@ -51,6 +52,11 @@ KdeConnectKcm::KdeConnectKcm(QObject *parent, const KPluginMetaData &md, const Q
     QApplication::setStyle(QStringLiteral("breeze"));
 #endif
 
+    // Default to org.kde.desktop style unless the user forces another style
+    if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE")) {
+        QQuickStyle::setStyle(QStringLiteral("org.kde.desktop"));
+    }
+
     kcmUi.setupUi(widget());
 
     sortProxyModel = new DevicesSortProxyModel(devicesModel);

urlhandler/CMakeLists.txt

@@ -12,6 +12,7 @@ target_link_libraries(kdeconnect-handler
     kdeconnectcore
     kdeconnectversion
     Qt::Widgets
+    Qt::QuickControls2
     KF6::CoreAddons
     KF6::ConfigWidgets
     KF6::DBusAddons

urlhandler/kdeconnect-handler.cpp

@@ -12,6 +12,7 @@
 #include <QDialog>
 #include <QFileDialog>
 #include <QMessageBox>
+#include <QQuickStyle>
 #include <QTextStream>
 #include <QUrl>
 
@@ -59,6 +60,11 @@ int main(int argc, char **argv)
     QApplication::setStyle(QStringLiteral("breeze"));
 #endif
 
+    // Default to org.kde.desktop style unless the user forces another style
+    if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE")) {
+        QQuickStyle::setStyle(QStringLiteral("org.kde.desktop"));
+    }
+
     QUrl urlToShare;
     bool open;
     QString deviceId;