Replace the inline ShareableCard in SharePreviewModal with a designed
QuestionShareCard: Sauci logo + wordmark header, pack badge, and a
branded sauci.app footer pill on the captured story image. The card
deliberately never carries the couple join code - it is a private
pairing credential, not a referral link (a regression test enforces
this). Text-share fallbacks now carry a full https://sauci.app link,
and all three share paths fire a new question_shared analytics event
with the destination.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
