fix(window-title): use named property instead of read-only implicitWidth

modules/Bar.qml

@@ -148,7 +148,7 @@ PanelWindow {
                 M.WindowTitle {
                     id: _windowTitle
                     readonly property real _maxWidth: Math.max(0, centerSection.x - _windowTitleGroup.x - 2 * M.Theme.groupPadding - M.Theme.groupSpacing)
-                    width: Math.min(implicitWidth, _maxWidth)
+                    width: Math.min(naturalWidth, _maxWidth)
                 }
             }
             Item {

modules/HoverPanel.qml

@@ -363,8 +363,7 @@ PanelWindow {
         color: "transparent"
         border.color: root.accentColor
         border.width: 1
-        bottomLeftRadius: M.Theme.radius
-        bottomRightRadius: M.Theme.radius
+        radius: M.Theme.radius
         opacity: panelContainer.opacity
     }
 }

modules/PopupBackground.qml

@@ -6,10 +6,7 @@ Rectangle {
 
     color: M.Theme.base01
     opacity: Math.max(M.Theme.barOpacity, 0.85)
-    topLeftRadius: 0
-    topRightRadius: 0
-    bottomLeftRadius: M.Theme.radius
-    bottomRightRadius: M.Theme.radius
+    radius: M.Theme.radius
     border.color: accentColor
     border.width: 1
 }

modules/WindowTitle.qml

@@ -19,7 +19,7 @@ M.BarSection {
     readonly property real _iconOffset: _icon.visible ? _icon.width + root.spacing : 0
 
     // Natural content width — Bar.qml uses this to cap the group width
-    implicitWidth: _iconOffset + _label.implicitWidth
+    readonly property real naturalWidth: _iconOffset + _label.implicitWidth
 
     IconImage {
         id: _icon