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 +1,46 @@
+#include <LayerShellQt/Shell>
+
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickWindow>
+#include <QUrl>
+#include <QtGlobal>
+
+int main(int argc, char *argv[])
+{
+    LayerShellQt::Shell::useLayerShell();
+
+    QGuiApplication app(argc, argv);
+    app.setApplicationName(QStringLiteral("nebula-shell"));
+    app.setApplicationDisplayName(QStringLiteral("Nebula Desktop"));
+    app.setOrganizationName(QStringLiteral("NebulaOS"));
+    app.setDesktopFileName(QStringLiteral("org.nebulaos.shell"));
+
+    QQuickWindow::setDefaultAlphaBuffer(true);
+
+    QQmlApplicationEngine engine;
+    engine.addImportPath(QStringLiteral("qrc:/qt/qml"));
+
+    QObject::connect(
+        &engine,
+        &QQmlApplicationEngine::objectCreationFailed,
+        &app,
+        []() {
+            qCritical("nebula-shell: failed to load the Nebula QML module.");
+            QCoreApplication::exit(EXIT_FAILURE);
+        },
+        Qt::QueuedConnection);
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+    engine.loadFromModule(QStringLiteral("Nebula.Shell"), QStringLiteral("Main"));
+#else
+    engine.load(QUrl(QStringLiteral("qrc:/qt/qml/Nebula/Shell/Main.qml")));
+#endif
+
+    if (engine.rootObjects().isEmpty()) {
+        qCritical("nebula-shell: failed to load the Nebula QML module.");
+        return EXIT_FAILURE;
+    }
+
+    return app.exec();
+}