Meta switched to CSS grid in undocked mode:
- row 1, col 1: From row (label + chip + chevron)
- row 1, col 2: action cluster
- row 2, span: To/Cc details
The cluster shrinks alongside the chip and flex-wraps into a 2-row
icon stack before crowding the chip. At very narrow pane widths
(< 380px via @container docpane) it snaps back to absolute overlay
so From: still fits.
Docked mode overrides meta back to flex column so the cluster
flows naturally last — under From, and under To/Cc when expanded.
7cf3402ef4