Workcat: cute desktop cat, no window closing

Reworks the example into a pure desktop-pet: the cat wanders, sits, grooms,
stretches, dashes and naps, reacts to petting and dragging, and follows the
cursor with its eyes. The window-scanning and Accessibility code is gone.

The cat is drawn from rounded primitives plus Shape paths in a fixed 100x90
design space, so it scales cleanly to any size.

Linux/X11 is the primary target: the tray is optional, Wayland gets a warning,
and WORKCAT_X11_BYPASS / WORKCAT_OPAQUE cover uncooperative window managers.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/main.cpp

@@ -0,0 +1,47 @@
+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickStyle>
+#include <QQuickWindow>
+#include <QLoggingCategory>
+
+#include "appsettings.h"
+#include "catcontroller.h"
+#include "traycontroller.h"
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setOrganizationName("workcat");
+    QCoreApplication::setOrganizationDomain("workcat.app");
+    QCoreApplication::setApplicationName("Workcat");
+    QApplication::setQuitOnLastWindowClosed(false);
+
+    // QApplication (not QGuiApplication) so QSystemTrayIcon can show a menu.
+    QApplication app(argc, argv);
+    QQuickStyle::setStyle("Basic");
+
+    AppSettings settings;
+    CatController cat(&settings);
+    TrayController tray(&cat);
+
+    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"))) {
+        qWarning("Workcat: Wayland does not let a client place its own window. "
+                 "Run with QT_QPA_PLATFORM=xcb for the cat to walk.");
+    }
+
+    QQmlApplicationEngine engine;
+    engine.setInitialProperties({
+        { "cat", QVariant::fromValue(&cat) },
+        { "settings", QVariant::fromValue(&settings) },
+    });
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreationFailed, &app,
+                     [] { QCoreApplication::exit(1); }, Qt::QueuedConnection);
+    engine.loadFromModule("Workcat", "Main");
+
+    if (auto *root = qobject_cast<QQuickWindow *>(engine.rootObjects().value(0))) {
+        cat.setWindow(root);
+        QObject::connect(&tray, &TrayController::settingsRequested, root,
+                         [root] { QMetaObject::invokeMethod(root, "openSettings"); });
+    }
+
+    return app.exec();
+}