Detect iPadOS multi-window mode and add padding for window control buttons

When running on iPadOS in multi-window mode (Stage Manager, Split View,
Slide Over), the window control buttons (red/yellow/green) at the top-left
overlap with the hamburger menu button. This adds:

- Native iOS detection via UIWindowScene API to check if window is smaller
  than screen (indicating multi-window mode)
- QML-side window width check for reactive updates when user enters/exits
  multi-window mode
- 70px left padding on toolbar when in multi-window mode on iPadOS

Fixes #4238

https://claude.ai/code/session_01VPuuPcJnU1GEtGy1vosET9

Author: claude

src/homeform.h

@@ -203,6 +203,7 @@ class homeform : public QObject {
     Q_PROPERTY(QString previewWorkoutDescription READ previewWorkoutDescription NOTIFY previewWorkoutDescriptionChanged)
     Q_PROPERTY(QString previewWorkoutTags READ previewWorkoutTags NOTIFY previewWorkoutTagsChanged)
     Q_PROPERTY(bool miles_unit READ miles_unit)
+    Q_PROPERTY(bool iPadMultiWindowMode READ iPadMultiWindowMode)
 
     Q_PROPERTY(bool currentCoordinateValid READ currentCoordinateValid)
     Q_PROPERTY(bool trainProgramLoadedWithVideo READ trainProgramLoadedWithVideo)
@@ -705,6 +706,14 @@ class homeform : public QObject {
         return settings.value(QZSettings::miles_unit, QZSettings::default_miles_unit).toBool();
     }
 
+    bool iPadMultiWindowMode() {
+#ifdef Q_OS_IOS
+        return lockscreen::isInMultiWindowMode();
+#else
+        return false;
+#endif
+    }
+
     bool currentCoordinateValid() {
         if (bluetoothManager && bluetoothManager->device()) {
             return bluetoothManager->device()->currentCordinate().isValid();

src/ios/lockscreen.h

@@ -111,6 +111,8 @@ class lockscreen {
     static void set_action_profile(const char* profile);
     static const char* get_action_profile();
 
+    // multi-window detection for iPadOS
+    static bool isInMultiWindowMode();
 };
 
 #endif // LOCKSCREEN_H

src/ios/lockscreen.mm

@@ -616,13 +616,43 @@
 
 void lockscreen::zwiftClickRemote_WriteCharacteristic(unsigned char* qdata, unsigned char length, void* deviceClass) {
     if (ios_zwiftClickRemotes == nil) return;
-    
+
     // Get the specific remote for this device
     NSValue *key = [NSValue valueWithPointer:deviceClass];
     ios_zwiftclickremote *remote = [ios_zwiftClickRemotes objectForKey:key];
-    
+
     if(remote) {
         [remote writeCharacteristic:qdata length:length];
     }
 }
+
+bool lockscreen::isInMultiWindowMode() {
+    // Check if we're on iPad and in multi-window mode (Stage Manager, Split View, Slide Over)
+    if (UIDevice.currentDevice.userInterfaceIdiom != UIUserInterfaceIdiomPad) {
+        return false;
+    }
+
+    if (@available(iOS 13.0, *)) {
+        // Get the foreground active scene
+        for (UIScene *scene in UIApplication.sharedApplication.connectedScenes) {
+            if (scene.activationState == UISceneActivationStateForegroundActive &&
+                [scene isKindOfClass:[UIWindowScene class]]) {
+                UIWindowScene *windowScene = (UIWindowScene *)scene;
+
+                // Get the window bounds and screen bounds
+                CGRect windowBounds = windowScene.coordinateSpace.bounds;
+                CGRect screenBounds = windowScene.screen.bounds;
+
+                // If window is smaller than screen in either dimension, we're in multi-window mode
+                // Add a small tolerance for floating point comparison
+                if (windowBounds.size.width < screenBounds.size.width - 1 ||
+                    windowBounds.size.height < screenBounds.size.height - 1) {
+                    return true;
+                }
+            }
+        }
+    }
+
+    return false;
+}
 #endif

src/main.qml

@@ -43,8 +43,18 @@ ApplicationWindow {
     }
 
     function getLeftPadding() {
+        // Add padding for iPadOS multi-window mode (Stage Manager, Split View, Slide Over)
+        // to avoid overlap with window control buttons (red/yellow/green)
+        // Check both the native detection and window size comparison for reactivity
+        if (Qt.platform.os === "ios") {
+            var isMultiWindow = (typeof rootItem !== "undefined" && rootItem && rootItem.iPadMultiWindowMode) ||
+                                (window.width < Screen.width - 10);  // Window smaller than screen = multi-window
+            if (isMultiWindow) {
+                return 70;  // Space for window control buttons
+            }
+        }
         if (Qt.platform.os !== "android" || AndroidStatusBar.apiLevel < 31) return 0;
-        return (Screen.orientation === Qt.LandscapeOrientation || Screen.orientation === Qt.InvertedLandscapeOrientation) ? 
+        return (Screen.orientation === Qt.LandscapeOrientation || Screen.orientation === Qt.InvertedLandscapeOrientation) ?
                AndroidStatusBar.leftInset : 0;
     }