From/To/Cc back on the left, action cluster (Reply / Reply-all /
Forward / AI / Summary / More) absolute-positioned top-right with a
gradient fade so chips that overflow slide cleanly underneath. The
recipient-chips lists no longer wrap — they scroll horizontally,
matching the account-chip strip pattern, so users can drag/swipe
to reveal recipients hidden under the action cluster.
Mobile (@media max-width:768px) gets the same row+absolute layout
instead of the previous column with actions on top. The narrow
container query (docpane max-width:460px) still falls back to
in-flow column so it doesn't overlap on very narrow panes.
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