refactor: unify offer and gift card rendering patterns

[orveth]

Summary

• Consolidated offer card images into the existing gift card CARD_IMAGES map with getCardByUrl() lookup
• Replaced OfferItem with GiftCardItem + hideOverlayContent prop for consistent card rendering
• Collapsed 3-way render branch in receive-cashu-token.tsx to 2-way (gift-card/offer share the same card image path)
• Deleted offer-card-images.ts and offer-item.tsx (no longer needed)

Addresses review comments #3 and #4 on PR #968.

Test plan

• Verify offer cards render correctly on the gift cards page
• Verify offer details page shows the correct card image
• Verify receive cashu token screen renders card images for both gift cards and offers

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
agicash	Ready	Preview, Comment	Mar 31, 2026 11:43pm

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[orveth]

keeper:review: PASS

Verified:

• All offer-card-images.ts / offer-item.tsx references removed (grepped full app/ tree)
• CARD_IMAGES consolidation covers the localhost:8104 entry from deleted file
• hideOverlayContent properly typed (boolean?) and consumed in GiftCardItem
• 2-way render in receive-cashu-token.tsx covers all prior 3-way cases
• loadOfferCardsFromEnv() retained — startup validation still enforced

Clean unification. Needs gudnuf or josip approval to merge.