Round timeline delegate headers

To match Kirigami's AbstractCard background

src/app/LocationInfoDelegate.qml

@@ -21,6 +21,7 @@ Kirigami.AbstractCard {
         Kirigami.Theme.colorSet: Kirigami.Theme.Complementary
         Kirigami.Theme.inherit: false
         color: Kirigami.Theme.backgroundColor
+        radius: Kirigami.Units.smallSpacing
         implicitHeight: headerLayout.implicitHeight + Kirigami.Units.largeSpacing * 2
         anchors.leftMargin: -root.leftPadding
         anchors.topMargin: -root.topPadding

src/app/TimelineDelegate.qml

@@ -52,6 +52,7 @@ Kirigami.AbstractCard {
         id: headerBackground
         Kirigami.Theme.colorSet: controller.isCurrent ? Kirigami.Theme.Selection : Kirigami.Theme.Complementary
         Kirigami.Theme.inherit: false
+        radius: Kirigami.Units.smallSpacing
         color: {
             if (controller.connectionWarning)
                 return Kirigami.Theme.negativeTextColor;

src/app/TransferDelegate.qml

@@ -22,6 +22,7 @@ Kirigami.AbstractCard {
         Kirigami.Theme.colorSet: Kirigami.Theme.Complementary
         Kirigami.Theme.inherit: false
         color: Kirigami.Theme.backgroundColor
+        radius: Kirigami.Units.smallSpacing
         implicitHeight: headerLayout.implicitHeight + Kirigami.Units.largeSpacing * 2
         anchors.leftMargin: -root.leftPadding
         anchors.topMargin: -root.topPadding

src/app/TripGroupDelegate.qml

@@ -27,6 +27,7 @@ Kirigami.AbstractCard {
         Kirigami.Theme.colorSet: Kirigami.Theme.Complementary
         Kirigami.Theme.inherit: false
         color: Kirigami.Theme.backgroundColor
+        radius: Kirigami.Units.smallSpacing
         implicitHeight: headerLayout.implicitHeight + Kirigami.Units.largeSpacing * 2
         anchors.leftMargin: -root.leftPadding
         anchors.topMargin: -root.topPadding

src/app/WeatherForecastDelegate.qml

@@ -23,6 +23,7 @@ Kirigami.AbstractCard {
         Kirigami.Theme.colorSet: Kirigami.Theme.Complementary
         Kirigami.Theme.inherit: false
         color: Kirigami.Theme.backgroundColor
+        radius: Kirigami.Units.smallSpacing
         implicitWidth: icon.implicitWidth + Kirigami.Units.largeSpacing * 2
         Layout.minimumHeight: implicitWidth
         Layout.fillHeight: true