Consider dropping 'px' postfixing for numeric CSS properties

## Motivation

After a discussion [on a React issue](https://github.com/facebook/react/pull/19286) and seeing where Preact 11 [is steering](https://github.com/preactjs/preact/issues/2621):

> adding `px` is definitely a historial feature that isn't as relevant these days. Folks should be opting to use relative units rather than static units (like `px`), otherwise they break their app/website to users who use zooming tools or accessibility tooling – invaliding [Web Content Accessibility Guidelines](https://www.w3.org/TR/WCAG21/).

> I've seen it confuse new developers first-hand when switching between writing CSS and declaring inline styles.

Start by locating the TypeScript code that appends units to numeric CSS properties and review how those properties are classified. Define the affected behavior and verify that numeric values no longer receive an automatic px suffix without changing other style handling.

Written by the indexing model from the issue text.