Background
We've inherited some ways of building our components from OOUI. One of these is represented in position-offset token category, currently used in Radio.
The negative position offset is building the focus outline on selected Radios.
We've got a second token with negative value, which is used to construct border overlaps, @position-offset-border-width-base.
The biggest issue, aside of the SFC, is currently user text zooming limitations.
| Before (very large user text zoom) | After |
 |  |
Acceptance criteria
- Replace Radio offset with relative size
- Replace Message offset SFCs with size tokens
