[Doberjohn]

Motivation

The Button "Appearance changes" list in the migration guide missed two differences from 5.x:

• The outlined outline is drawn in outlineVariant instead of outline, disabled or not (5.x used surfaceDisabled when disabled), so a theme that recolored it through outline no longer does. This changed in feat: add DynamicTheme using PlatformColor #4901.
• Banner actions are plain text buttons now that compact is gone: 16dp of horizontal padding instead of 8dp, and the 64dp minimum width.

Snackbar actions were never compact on MD3, so the existing padding line covers them.

Related issue

Follow-up to #5097

Screenshots / Videos

Docs only

Test plan

• yarn --cwd docs build passes; the section renders on the dev server.
• yarn lint passes.
• Both lines checked against Button/utils.tsx and Banner.tsx on main and v5.15.4.

[github-actions]

Found potential problems with the pull request:

• Screenshot or video evidence is missing. Make sure to include one if it affects the UI.