The expanded email card painted a kebab menu in its title row because
the per-card .memory-item-actions menu at the bottom was hidden while
expanded. Both pointed at _showCardMenu(em). Remove the duplicate:
- Drop the email-card-header-menu button (and its rightCluster
wrapper) — title row now just holds the nav arrows.
- Remove the CSS rule that hid .memory-item-actions on
.email-card-expanded so the bottom kebab stays visible.
- Unread-dot insert point retargets to .email-card-nav-arrows now
that the rightCluster is gone.
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