Restructured the DOM so the Reply / Reply-all / Forward row lives
INSIDE the email-reader-meta-from div (after the chips span), and
the Summary / AI / More row sits directly below as a sibling of
From inside the meta. Killed the outer email-reader-actions
wrapper that kept letting the buttons drift out of position.
CSS now pushes the primary row right via margin-left:auto on the
From row and right-aligns the secondary row below it.
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