Content-level Cashu support, no wire-protocol changes:
- CashuTokenDecoder: summarizes V3 (cashuA base64url-JSON) tokens —
amount summed across proofs, unit, mint host, memo — and V4 (cashuB)
via a minimal bounded CBOR reader. All input is treated as
adversarial: size caps, depth/item budgets, overflow guards, display
sanitization; malformed payloads fail closed to a generic chip.
- PaymentChipView: cashu chips now show "500 sat · mint.example.com"
(+ memo) instead of a generic label; tap opens a cashu: wallet URL
and falls back to https://redeem.cashu.me when no wallet handles it;
context menu adds copy token / redeem in wallet / redeem on web.
- extractCashuLinks now returns bare deduplicated bearer strings so the
chip can decode them (cashu: URIs still detected via the embedded
token).
- /pay <token>: validates the token decodes, sends it as the message
body; DMs send directly, public channels require an explicit
"/pay <token> public" confirm since tokens are bearer instruments.
Suggested everywhere except public geohash channels.
- Tests: decoder (V3/V4 decode, summation, URI forms, truncation/
garbage/huge fuzzing, CBOR depth bounds) and /pay command flows.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
