feat: add primary button

AppPrimaryButton.qml

@@ -0,0 +1,23 @@
+import QtQuick
+import QtQuick.Controls.Basic
+import QtQuick.Controls.impl // Needed for features like the Control.blend() function
+import DesignSystem
+
+Button {
+    id: control
+    font.family: Fonts.dotrice
+    font.bold: true
+
+    background: Rectangle {
+        // NOTE: copied from ~/Qt/6.8.3/macos/qml/QtQuick/Controls/Basic/Button.qml
+        implicitWidth: 100
+        implicitHeight: 40
+        visible: !control.flat || control.down || control.checked || control.highlighted
+        color: Color.blend(control.checked || control.highlighted ? control.palette.dark : control.palette.button,
+                                                                    control.palette.mid, control.down ? 0.5 : 0.0)
+        border.color: control.palette.highlight
+        border.width: control.visualFocus ? 2 : 0
+        // custom
+        radius: Theme.radius
+    }
+}

CMakeLists.txt

@@ -12,6 +12,7 @@ qt_add_library(designsystem STATIC)
 set(plain_qml_files
   AppText.qml
   AppIcon.qml
+  AppPrimaryButton.qml
 )
 set(qml_singletons
   Fonts.qml