Two bugs reported on the new mail-pattern flow:
1. The sheet sent the full local@domain.tld pattern to the backend so a
user blocking communications@only4-subscribers.com would only catch
that exact local-part — newsletter@, info@, promo@ from the same
sender would slip through. Casino affiliates rotate the local-part
on every blast while keeping the domain stable, so we now strip the
local-part on submit. The preview-card under the input shows what
actually gets stored (only4-subscribers.com), so the user sees the
pattern that will hit. Bare tokens without "@" stay as-is and reach
the backend as display-name candidates.
2. FormSheet's backdrop was a <Pressable> — straight violation of the
"TouchableOpacity, never Pressable" rule. Swapped for
<TouchableOpacity activeOpacity={1}> so the tap-to-dismiss still
works with no visible feedback on the dim layer.
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