Support for macOS Liquid Glass Icons (.icon bundle / Assets.car)

[megawron]

Is your feature request related to a problem? Please describe.

As Mac user I see the Icons in the newest version (MACOS 26) are more and more updated to match the liquid glass effect. Also these icons are adaptive for theme changes (darkmode, transparent mode). Currently the wails app icons don't support it.

Describe the solution you'd like

If you put the icon file from the Icon Composer (.Icon) in the build folder it should use it as the app icon for the Mac build.
Additionally for getting closer to cross compiling, it should be also possible to put the Assets.car file from actool (MACOS xcode tool for generating the the icons from the bundle file) to the build directory so it will be possible to cross compile it. here are more information

Describe alternatives you've considered

actool is proprietary aswell as Icon Composer so its not possible to generate the new liquid icons without access to a Mac saddly.

Additional context

for reference the solution of the electron project

[wimaha]

As I understand it, we need the .car file in the app container for this to work. The workflow would therefore be to provide an optional Icon Composer file and generate a .car file.
I put this together locally for myself. However, I have to build the .car file manually. When I have time, I can update the build-assets workflow and create a pull request for it.

[wimaha]

Maybe this could be closed, because we have this in v3 starting with alpha 65: https://github.com/wailsapp/wails/releases/tag/v3.0.0-alpha.65