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*** Title
macOS tool bar button does not highlight on mouse over

*** Description
The macOS tool bar button does not highlight when the mouse pointer is brought over the button. This is expected behavior for macOS applications.

Note that the tool bar button highlight behavior is seen with Emacs PGTK running on Linux.

*** Environment
GNU Emacs 30.1 (build 2, aarch64-apple-darwin24.3.0, NS appkit-2575.40 Version 15.3.1 (Build 24D70)) of 2025-02-27
Darwin bingsu.local 24.3.0 Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:16 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6000 arm64 arm Darwin

*** Steps to Reproduce
1. Launch GUI Emacs with tool-bar-mode enabled on macOS.
2. Move the mouse pointer over a tool bar button.
   
*** Expected Result
The tool bar button should be highlighted. An example of this is shown in the attached image macos-toolbar-highlight-expected.png