fix(wallets): never emit unresolvable via types from IBEX transaction mapping

[islandbitcoin]

Problem

Any IBEX transaction row with an unrecognized currencyId or transactionTypeId maps to initiationVia/settlementVia: { type: "unknown" }. The InitiationVia/SettlementVia GraphQL unions resolve members via isTypeOf checks that only match intraledger/lightning/onchain, and both fields are NonNull — so graphql-js throws:

Abstract type 'InitiationVia' must resolve to an Object type at runtime for field 'Transaction.initiationVia'

One bad row fails the entire transaction list query for the account: home screen and transaction history go down in the mobile app. This is live on TEST today (dev builds default to the Test instance) and becomes a prod incident as soon as the #413 code path meets a legacy/BTC-denominated or new-swap-type IBEX row on Main, because #413 narrowed the currency mapping to USD (3) / USDT (29) only and the type switch handles only 1,2 (LN) and 3,4,10 (onchain).

Fix

• Unknown currencyId → exclude the row from the list (error log kept). It cannot be represented truthfully; a fabricated $0 USD row or a crashed query are both worse. This keeps feat(epic): bridge integration #413's deliberate decision not to misclassify unknown currencies as BTC.
• Unknown transactionTypeId → amounts and currency are valid, so render as a generic intraledger transaction (all union fields nullable) instead of hiding money movement (error log kept, includes the offending type id).
• Remove UnknownTypeTransaction from the domain types so no code path can emit { type: "unknown" } again — the compiler now rejects it.
• Defense in depth: add resolveType with a logged intraledger fallback on both unions, so an unrecognized source degrades to a renderable member instead of failing the whole list, whatever the producer.

No schema change (yarn check:sdl clean — union membership is untouched).

Tests

• test/flash/unit/app/wallets/get-transactions-for-wallet.spec.ts: unknown currency rows are excluded + logged; unknown type ids render as intraledger with correct amounts + logged; exhaustive sweep asserting every currencyId × transactionTypeId combination only ever emits union-resolvable via types.
• test/flash/unit/graphql/shared/types/abstract/via-unions.spec.ts (new): both unions resolve all known methods to the right object types and fall back with a logged error for unrecognized sources.
• Full unit suite: 137 suites / 1088 tests green. yarn tsc-check clean.

Ops note

The two error-log paths (Failed to parse Ibex transaction currency/type) include the concrete currencyId/transactionTypeId — worth watching after deploy to add explicit mappings for whatever IBEX is actually returning (the ibex-swap A/B on TEST is a likely source).

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