Add Qt/QML desktop shell and Nebula.UI

Introduce a new production desktop shell at `shells/desktop/shell` built with C++20, Qt Quick/QML, and LayerShellQt, including top bar, launcher, desktop surfaces, shell state, and mock app data. Add the shared `packages/nebula-ui` QML module (theme, controls, focus, icons) and wire it into the shell build. Retire the old GTK/WebKit native host by removing `shells/desktop/native`, move the React shell UI to `shells/desktop/prototype-react` as an archived design reference, and update root/compositor/session documentation to reflect the new Linux-only production architecture and temporary Sway role.
2026-08-26 16:34:40 +12:00
parent 5504d3cfb8
commit befed8ff96
80 changed files with 2128 additions and 609 deletions
@@ -0,0 +1,64 @@
+import QtQuick
+import Nebula.UI
+
+Item {
+    id: root
+
+    implicitWidth: row.implicitWidth + 18
+    implicitHeight: Theme.controlHeight
+    property bool checked: false
+
+    signal clicked()
+
+    Accessible.role: Accessible.Button
+    Accessible.name: qsTr("Nebula")
+    Accessible.checkable: true
+    Accessible.checked: root.checked
+    Accessible.onPressAction: root.clicked()
+
+    Rectangle {
+        anchors.fill: parent
+        radius: Theme.radiusSmall
+        color: (hover.containsMouse || root.checked) ? Theme.accentSoft : "transparent"
+
+        Behavior on color {
+            ColorAnimation {
+                duration: Theme.animationFast
+            }
+        }
+    }
+
+    Row {
+        id: row
+        anchors.centerIn: parent
+        spacing: 8
+
+        NebulaIcon {
+            name: "nebula"
+            size: 18
+            color: root.checked ? Theme.accentStrong : Theme.textPrimary
+            anchors.verticalCenter: parent.verticalCenter
+        }
+
+        Text {
+            text: qsTr("Nebula")
+            color: root.checked ? Theme.accentStrong : Theme.textPrimary
+            font.family: Theme.fontFamily
+            font.pixelSize: Theme.fontSize
+            font.weight: Font.DemiBold
+            anchors.verticalCenter: parent.verticalCenter
+        }
+    }
+
+    MouseArea {
+        id: hover
+        anchors.fill: parent
+        hoverEnabled: true
+        cursorShape: Qt.PointingHandCursor
+        onClicked: root.clicked()
+    }
+
+    FocusFrame {
+        radius: Theme.radiusSmall
+    }
+}