trunk
UI: Use focus styles from base-styles (#80635)
UI: Disable instant overlay popup transitions (#79432)
DS: Name font weight tokens by intent (#80093)
Button: Suppress UA focus ring when focused and pressed (#81113)
Theme: Remove elevation tokens (#80099)
UI: Simplify focus ring styles (#78823)
UI: Update CSS cascade layers to use nesting (#78959)
theme: rename `bg`/`fg` design token groups to `background`/`foreground` (#79098)