Improve macOS Icon pattern to prevent collaboration issues

Replace invisible CR with character class Icon[^!-~]

The literal CR character is frequently corrupted by:
- Text editors auto-trimming invisible chars
- Formatting tools (editorconfig) normalizing line endings
- Copy/paste operations losing special characters
- IDE auto-formatting and linting tools

Character class pattern is collaboration-safe and functionally identical.

Global/macOS.gitignore

@@ -3,7 +3,10 @@
 __MACOSX/
 .AppleDouble
 .LSOverride
-Icon[␍]
+
+# Finder custom icons
+# Pattern [^!-~] prevents corruption by line-ending converters and editor auto-formatting
+Icon[^!-~]
 
 # Thumbnails
 ._*