Add floating traffic-light window chrome

Introduces a dedicated layer-shell `WindowChromeSurface` that renders macOS-style traffic-light controls over the focused Sway window titlebar, replacing the old top-bar window controls. Adds theme tokens and a reusable `TrafficLightButton` component, updates shell QML/CMake wiring, and adjusts Sway titlebar padding/title format so window titles do not overlap the overlay. Window tracking was extended with focused-window geometry/deco/fullscreen properties plus backend refresh support so the chrome follows window movement and state changes in near real time.

core/windows/backends/sway/SwayWindowBackend.cpp

@@ -236,6 +236,52 @@ bool SwayWindowBackend::switchWorkspace(const QString &workspaceId)
     return run(QStringLiteral("workspace \"%1\"").arg(quoteCriteriaValue(workspaceId)));
 }
 
+bool SwayWindowBackend::updateFocusedGeometry()
+{
+    if (!m_ipc->isConnected() || m_focusedWindowId == 0)
+        return false;
+
+    const QJsonDocument tree = m_ipc->request(SwayIpcClient::GetTree);
+    if (!tree.isObject())
+        return false;
+
+    QVector<WindowInfo> windows;
+    QVector<WorkspaceInfo> workspaces;
+    collect(tree.object(), {}, {}, false, &windows, &workspaces);
+
+    for (WindowInfo &window : windows) {
+        if (window.id != m_focusedWindowId)
+            continue;
+        for (WindowInfo &cached : m_windows) {
+            if (cached.id != window.id)
+                continue;
+            if (cached.x == window.x
+                && cached.y == window.y
+                && cached.width == window.width
+                && cached.height == window.height
+                && cached.decoX == window.decoX
+                && cached.decoY == window.decoY
+                && cached.decoWidth == window.decoWidth
+                && cached.decoHeight == window.decoHeight
+                && cached.fullscreen == window.fullscreen)
+                return false;
+            cached.x = window.x;
+            cached.y = window.y;
+            cached.width = window.width;
+            cached.height = window.height;
+            cached.decoX = window.decoX;
+            cached.decoY = window.decoY;
+            cached.decoWidth = window.decoWidth;
+            cached.decoHeight = window.decoHeight;
+            cached.fullscreen = window.fullscreen;
+            return true;
+        }
+        break;
+    }
+
+    return false;
+}
+
 void SwayWindowBackend::tryConnect()
 {
     if (m_ipc->isConnected())
@@ -422,7 +468,8 @@ bool SwayWindowBackend::isShellChrome(const QJsonObject &node)
     const QString name = node.value(QStringLiteral("name")).toString();
     if (name == QLatin1String("Nebula Desktop")
         || name == QLatin1String("Nebula Top Bar")
-        || name == QLatin1String("Nebula Launcher")) {
+        || name == QLatin1String("Nebula Launcher")
+        || name == QLatin1String("Nebula Window Chrome")) {
         return true;
     }
 
@@ -491,6 +538,11 @@ void SwayWindowBackend::collect(const QJsonObject &node,
         window.y = rect.value(QStringLiteral("y")).toInt();
         window.width = rect.value(QStringLiteral("width")).toInt();
         window.height = rect.value(QStringLiteral("height")).toInt();
+        const QJsonObject deco = node.value(QStringLiteral("deco_rect")).toObject();
+        window.decoX = deco.value(QStringLiteral("x")).toInt();
+        window.decoY = deco.value(QStringLiteral("y")).toInt();
+        window.decoWidth = deco.value(QStringLiteral("width")).toInt();
+        window.decoHeight = deco.value(QStringLiteral("height")).toInt();
         windows->append(window);
     }
 

core/windows/backends/sway/SwayWindowBackend.hpp

@@ -32,6 +32,7 @@ public:
     bool resizeWindow(qint64 windowId, int width, int height) override;
     bool snapWindow(qint64 windowId, SnapEdge edge) override;
     bool switchWorkspace(const QString &workspaceId) override;
+    bool updateFocusedGeometry() override;
 
 private:
     void tryConnect();