Fix compatibility issues with macOS 26 NIB loading

Cocoa/GBJoyConManager.m

@@ -16,7 +16,7 @@
     static GBJoyConManager *manager = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
-        manager = [[self alloc] _init];
+        manager = [[super allocWithZone:nil] _init];
     });
     return manager;
 }
@@ -32,6 +32,16 @@
     return ret;
 }
 
++ (instancetype)allocWithZone:(struct _NSZone *)zone
+{
+    return [self sharedInstance];
+}
+
++ (instancetype)alloc
+{
+    return [self sharedInstance];
+}
+
 - (instancetype)init
 {
     return [self.class sharedInstance];

Cocoa/GBPaletteEditorController.m

@@ -399,10 +399,16 @@ static double blend(double from, double to, double position)
     [sender.window.sheetParent endSheet:sender.window];
 }
 
-- (instancetype)init
++ (instancetype)alloc
 {
     static id singleton = nil;
     if (singleton) return singleton;
-    return (singleton = [super init]);
+    return (singleton = [super allocWithZone:nil]);
 }
+
++ (instancetype)allocWithZone:(struct _NSZone *)zone
+{
+    return [self alloc];
+}
+
 @end