feat(codegolf): reduce browser code

[pveyes]

Refactor conversion logic by

• Use Array.from instead of creating new array and for loop & array.push
• reducing repeated long property access (obj.property) by assigning to another variable that can be minified better
• removing full JSON attribute mapping and rely more on DOM property

Also simplify file structure and group attribute mapping into single file

Size comparison

	gzipped	original
Before	1.68 kB	3.5 kB
After	1.2 kB	2.4 kB

~29% reduction