refactor: clean up knownThemes declaration and remove deprecated version-global.js

Author: murdercode

src/utils/theme-loader.js

@@ -39,7 +39,7 @@ class ThemeLoader {
         // that gets updated by the build process or manually maintained
 
         // This could be enhanced to use a build-time script that generates this list
-                                                                                                                                                                                                                                                                                                                                                                const knownThemes = [
+                                                                                                                                                                                                                                                                                                                                                                        const knownThemes = [
             'espresso.css',
             'pipboy.css',
             'pommodore64.css'