UI/AppKit: Add UI components to enable DevTools at runtime

Author: https://github.com/trflynn89
Commit: 28574e2812
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3956

UI/AppKit/Interface/InfoBar.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#import <Cocoa/Cocoa.h>
+
+@class Tab;
+
+using InfoBarDismissed = void (^)(void);
+
+@interface InfoBar : NSStackView
+
+- (void)showWithMessage:(NSString*)message
+    dismissButtonTooltip:(NSString*)tooltip
+    dismissButtonClicked:(InfoBarDismissed)on_dimissed
+               activeTab:(Tab*)tab;
+- (void)hide;
+
+- (void)tabBecameActive:(Tab*)tab;
+
+@end