Rename to TNCat, add chip chase, G-codes and a Wayland layout

The project is now TNCat, after HEIDENHAIN's TNC controls. Binary, QML module
URI, settings path, bundle id and .desktop entry follow; the environment
switches are TNCAT_*.

Entertainment: a curled steel chip skitters in every minute or two, the cat
runs it down and bats it away a few times before sitting back looking pleased.
Mood changes flash the matching machine code above its head, G00 for a sprint,
G01 for a stroll, M08 while it washes, G28 for a stretch, M30 for a nap.

Window handling was split into two layouts. X11 and macOS keep one small window
per object, positioned by the app. Wayland gets a screen-filling overlay whose
input region is masked down to the cat, since a Wayland client cannot place its
own window. Overlay mode is automatic there and available elsewhere via
TNCAT_OVERLAY=1.

Also adds a ground-line setting so the cat can walk above a softkey row.

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

qml/Main.qml

@@ -1,87 +1,42 @@
 pragma ComponentBehavior: Bound
 import QtQuick
-import Workcat
+import TNCat
 
-Window {
-    id: root
+// Root is not a window: which windows exist depends on the platform.
+QtObject {
+    id: app
 
     required property CatController cat
     required property AppSettings settings
 
-    readonly property var moodNames: ["walking", "running", "sitting", "grooming", "stretching", "sleeping", "loving", "alert"]
-    readonly property real floorY: Screen.desktopAvailableHeight - height
-
     function openSettings() {
-        settingsLoader.active = true
-        if (settingsLoader.status === Loader.Ready)
-            (settingsLoader.item as SettingsWindow).show()
+        settingsWindow.show()
+        settingsWindow.raise()
+        settingsWindow.requestActivate()
     }
 
-    width: settings.catSize
-    height: Math.round(settings.catSize * 0.9)
-    x: cat.x
-    y: floorY
-    color: Platform.opaqueBackground ? settings.coat : "transparent"
-    flags: Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.Tool
-           | Qt.NoDropShadowWindowHint | Qt.WindowDoesNotAcceptFocus
-           | (Platform.bypassWindowManager ? Qt.X11BypassWindowManagerHint : 0)
-    visible: true
-    title: qsTr("Workcat")
-
-    Component.onCompleted: {
-        cat.screenWidth = Screen.desktopAvailableWidth
-        cat.catWidth = width
-    }
-    onWidthChanged: cat.catWidth = width
-    Screen.onDesktopAvailableWidthChanged: cat.screenWidth = Screen.desktopAvailableWidth
-
-    Cat {
-        id: sprite
-        anchors.fill: parent
-        coat: root.settings.coat
-        facingRight: root.cat.facingRight
-        mood: root.moodNames[root.cat.mood]
-        lifted: root.cat.dragging
-        petted: root.cat.hovered && !root.cat.dragging
-        look: root.cat.look
-
-        Accessible.role: Accessible.Button
-        Accessible.name: qsTr("Workcat")
+    readonly property CatWindow catWindow: CatWindow {
+        cat: app.cat
+        settings: app.settings
+        visible: !Platform.overlayMode
+        onSettingsRequested: app.openSettings()
     }
 
-    HoverHandler {
-        onHoveredChanged: root.cat.hovered = hovered
+    readonly property ChipWindow chipWindow: ChipWindow {
+        cat: app.cat
+        settings: app.settings
+        visible: !Platform.overlayMode && app.cat.chipVisible
     }
 
-    DragHandler {
-        target: null
-        onActiveChanged: root.cat.dragging = active
-        onCentroidChanged: {
-            if (active)
-                root.cat.x = Math.max(0, Math.min(root.cat.screenWidth - root.width,
-                                                  root.x + centroid.position.x - centroid.pressPosition.x))
-        }
+    readonly property OverlayWindow overlayWindow: OverlayWindow {
+        cat: app.cat
+        settings: app.settings
+        active: Platform.overlayMode
+        onSettingsRequested: app.openSettings()
     }
 
-    TapHandler {
-        acceptedButtons: Qt.LeftButton
-        onTapped: root.cat.pet()
-        onDoubleTapped: root.openSettings()
-    }
-
-    TapHandler {
-        acceptedButtons: Qt.RightButton
-        onTapped: root.openSettings()
-    }
-
-    Loader {
-        id: settingsLoader
-        active: false
-        sourceComponent: SettingsWindow {
-            cat: root.cat
-            settings: root.settings
-            onClosing: settingsLoader.active = false
-        }
-        onLoaded: (item as SettingsWindow).show()
+    readonly property SettingsWindow settingsWindow: SettingsWindow {
+        cat: app.cat
+        settings: app.settings
     }
 }