1. Moved the min-height from .email-reader-header to .email-reader-meta
(92px) inside the <600 container query. Targeting the container
itself in its own @container rule was flaky; using a descendant
that affects the parent's intrinsic height works reliably.
2. Dropped the margin-top:0 reset on the cluster in the <380 overlay
rule — that was clearing the base -7px lift and sliding the
cluster ~7px downward at the breakpoint. Now both states use the
same -7px lift so the visual position is stable across the
transition.
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