It borrowed the connected group's corner variables, so its inner corners were
wrong at four of five sizes and shrank under the finger where SplitButton*Tokens
grows them; its chevron took the icon-button table's size at every step, sat dead
centre, and turned over on the expressive spring. groups.css now carries
--split-inner, --split-icon and --split-nudge per size, and the rotation uses
M3's standard scheme. Plan step 18, actions.md ACT-06, ACT-07, ACT-29, ACT-30.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
