Default handling of .icon files (Xcode 26)

[marchyman]

Xcode 26 treats packages generated with Icon Composer as a file.

-		49200A152E20346600F811C8 /* AppIcon.icon in Resources */ = {isa = PBXBuildFile; fileRef = 49200A142E20346600F811C8 /* AppIcon.icon */; };

Xcodegen by default treats the package contents as individual files

+		A20B1E789EBBD27F04D764F3 /* icon.json in Resources */ = {isa = PBXBuildFile; fileRef = 02B01BF10E42FBA9C741D622 /* icon.json */; };
+		14861B4340D6284EE4C162C4 /* smbc.svg in Resources */ = {isa = PBXBuildFile; fileRef = 79E38677ADEE0C7DF7A6EDF7 /* smbc.svg */; };

This breaks Xcode's recognition of the file as an icon. Adding this option resolves the issue:

options:
  fileTypes:
    "icon":
      file: true 

But it would be nice if this were handled by default.