feat: add card

AppCard.qml

@@ -0,0 +1,28 @@
+import QtQuick
+import QtQuick.Controls.Basic
+
+Item {
+  id: root
+  
+  property real padding: 10
+  
+  // Automatically size based on content plus padding
+  implicitWidth: contentItem.childrenRect.width + padding * 2
+  implicitHeight: contentItem.childrenRect.height + padding * 2
+  
+  // Background
+  Rectangle {
+    anchors.fill: parent
+    color: Theme.card
+    radius: Theme.radius
+  }
+
+  // This allows direct assignment of children to AppCard
+  default property alias content: contentItem.children
+  // Content container
+  Item {
+    id: contentItem
+    anchors.fill: parent
+    anchors.margins: padding
+  }
+}

CMakeLists.txt

@@ -13,6 +13,7 @@ set(plain_qml_files
   AppText.qml
   AppIcon.qml
   AppPrimaryButton.qml
+  AppCard.qml
 )
 set(qml_singletons
   Fonts.qml