fix: GUI now floats over Ableton in fullscreen mode

Root cause: NSWindow needs collection behavior flags to appear in
fullscreen Spaces. Without them, macOS puts the window in a separate
Space (different desktop), causing the 'opens in new window' behavior.

Fix adds to showAsFloatingPanel():
- canJoinAllSpaces (1 << 0) — window can appear on any Space
- fullScreenAuxiliary (1 << 8) — window can overlay fullscreen apps
- Window level raised to 25 (NSStatusWindowLevel) which is above
fullscreen app level

This means the plugin GUI will float over Ableton whether Ableton
is windowed OR fullscreen.

Source/Helper/HelperPluginHost.cpp

@@ -10,6 +10,7 @@
 #endif
 
 // Show window as floating panel without activating this app or stealing focus
+// Works in BOTH windowed and fullscreen mode
 static void showAsFloatingPanel(juce::Component* window)
 {
 #if JUCE_MAC
@@ -17,9 +18,17 @@ static void showAsFloatingPanel(juce::Component* window)
     {
         auto* nsWindow = (id)peer->getNativeHandle();
 
-        // Set window level to floating (above normal windows)
-        // NSFloatingWindowLevel = 3
-        ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setLevel:"), 3);
+        // --- COLLECTION BEHAVIOR (critical for fullscreen) ---
+        // canJoinAllSpaces = 1 << 0  (window appears on ALL Spaces/desktops)
+        // fullScreenAuxiliary = 1 << 8  (window can float over fullscreen apps)
+        // Combined = 257
+        long behavior = (1 << 0) | (1 << 8);
+        ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setCollectionBehavior:"), behavior);
+
+        // --- WINDOW LEVEL ---
+        // NSStatusWindowLevel = 25 (above fullscreen apps)
+        // NSFloatingWindowLevel = 3 is NOT enough — fullscreen apps are higher
+        ((void(*)(id, SEL, long))objc_msgSend)(nsWindow, sel_registerName("setLevel:"), 25);
 
         // Don't hide on deactivate (stay visible when helper loses focus)
         ((void(*)(id, SEL, int))objc_msgSend)(nsWindow, sel_registerName("setHidesOnDeactivate:"), 0);
@@ -290,7 +299,7 @@ void HelperPluginHost::showGui()
         guiWindow->centreWithSize(editor->getWidth(), editor->getHeight());
         guiWindow->setVisible(true);
 
-        // Make it float without stealing focus
+        // Make it float without stealing focus — works in windowed AND fullscreen
         showAsFloatingPanel(guiWindow.get());
     });
 }