Summary

Two sell-side cubits whose source files are NOT in PR #321's diff (only the underlying services are).

What each covers

• sell_confirm_cubit: initial `SellConfirmInitial`; happy path passes through Loading and ends in Success (service mock suspends 10ms so the broadcast-stream listener can observe Loading); service throw → Failure carrying the error string.
• sell_payment_info_cubit:
  • `getPaymentInfo` happy path emits Success with `isBitbox=false` for a `SoftwareWallet`; `isBitbox=true` for a `BitboxWallet` stub.
  • Exception mapping: `KycLevelRequiredException` → `Failure(kycRequired, requiredLevel)`; `RegistrationRequiredException` → `Failure(registrationRequired)`; generic → `Failure(unknown, message)`.
  • `validateMinAmount` (the parallel to buy_payment_info_cubit's min check, but here it's a CHF-10 floor): below floor emits `MinAmountNotMet`; above leaves the state untouched; EUR scaled by `getChfToEurRate` (ceil); a prior `MinAmountNotMet` is cleared back to `Initial` when the amount rises; comma decimal normalised to dot; empty string treated as 0.

Notes

• Both cubits use `SellPaymentInfo` which has 13 required fields. Tests construct one real instance with stub addresses + a no-op Eip7702Data so the value can be passed around without mocktail fallback registration.
• For the BitBox-wallet test, a tiny `_BitboxStubWallet extends AWallet` is used (only `walletType` is read; `primaryAccount` / `currentAccount` throw to make the intent explicit).

Test plan

• `flutter analyze` on both new files — clean
• `flutter test` — 15 / 15 passing locally
• CI green