Use logical properties to support RTL and more writing modes

[OverflowCat]

This PR replaces physical properties with logical ones to enhance support for languages that are not left-to-right (LTR).

I’ve updated the demo to showcase different options:

While logical properties are not new, frameworks like Tailwind have only recently begun incorporating them more extensively. The properties used in this PR require Chromium 87+ (released on 2020-11-17). If backward compatibility or upstream mergability is a concern, feel free to skip this PR :-) Another option is to use the PostCSS Logical Properties and Values plugin for fallback support if you’re working in an LTR-only environment.

Additionally, I suggest we consider adding i18n features, or at least allowing users to customize button text.