[kcms/users]: Add slight gradient to initials avatars

kcms/users/package/contents/ui/UserDetailsPage.qml

@@ -422,6 +422,15 @@ SimpleKCM {
                                 anchors.fill: parent
                                 anchors.margins: Kirigami.Units.smallSpacing
                                 color: modelData.color
+
+                                Rectangle {
+                                    anchors.fill: parent
+                                    gradient: Gradient {
+                                        GradientStop { position: 0.0; color: "transparent" }
+                                        GradientStop { position: 1.0; color: Qt.rgba(0, 0, 0, 0.3) }
+                                    }
+                                }
+
                                 Kirigami.Heading {
                                     anchors.centerIn: parent
                                     color: modelData.dark ? "white" : "black"