test ✅: add coverage for shared utility functions

Add comprehensive tests for shared utility modules to improve code coverage:

- Test property name extraction edge cases
- Test CSS property priority map with invalid groups
- Test order strategy visitor creator edge cases
- Test font face property order enforcer early returns
- Test style node processor with arrays and null values

These tests ensure all code paths in shared utilities are properly exercised,
including error handling and edge cases.

scripts/update-version.mjs

@@ -30,4 +30,4 @@ indexTsContent = indexTsContent.replace(/version: '(\d+\.\d+\.\d+)'/, `version:
 // Write the updated content back to src/index.ts
 await fs.writeFile(indexTsPath, indexTsContent);
 
-console.log(`Updated src/index.ts to version ${newVersion}`);
+console.log(`Updated package.json and src/index.ts to version ${newVersion}`);