[Help wanted] Request for testing on macOS 26 Tahoe Beta

[CarterLi]

According to the screenshot of WWDC25

1. OS is missing
2. DE should be Liquid Glass instead of Aqua

Both issues should be fixed in the dev branch. Platform API of GPU should correctly report Metal 4 too.

If someone wants to help:

1. cat /System/Library/CoreServices/SystemVersion.plist. If it fails, sw_ver
2. Download the nightly build and run fastfetch -c all