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 +1,58 @@
+import QtQuick
+import Nebula.UI
+
+Item {
+    id: root
+
+    implicitHeight: Theme.topBarHeight
+
+    Rectangle {
+        anchors.fill: parent
+        color: Theme.topBarBackground
+
+        Rectangle {
+            anchors.left: parent.left
+            anchors.right: parent.right
+            anchors.bottom: parent.bottom
+            height: 1
+            color: Theme.border
+        }
+    }
+
+    Row {
+        id: left
+        anchors.left: parent.left
+        anchors.leftMargin: 6
+        anchors.verticalCenter: parent.verticalCenter
+        spacing: 8
+
+        NebulaButton {
+            checked: ShellState.launcherOpen
+            onClicked: ShellState.toggleLauncher()
+        }
+
+        Rectangle {
+            anchors.verticalCenter: parent.verticalCenter
+            width: 1
+            height: 14
+            color: Theme.borderStrong
+        }
+
+        Text {
+            anchors.verticalCenter: parent.verticalCenter
+            width: Math.min(implicitWidth, root.width * 0.4)
+            text: ShellState.activeApplication
+            color: Theme.textSecondary
+            font.family: Theme.fontFamily
+            font.pixelSize: Theme.fontSize
+            elide: Text.ElideRight
+            maximumLineCount: 1
+        }
+    }
+
+    SystemArea {
+        anchors.right: parent.right
+        anchors.rightMargin: 10
+        anchors.verticalCenter: parent.verticalCenter
+    }
+}