refactor(engine): wire TransactionController into @metamask/wallet init

Move TransactionController construction into the @metamask/wallet-owned
wallet-init flow, mirroring extension PR #43182. The wallet now owns the
TransactionController controller messenger and persisted state; the legacy
messenger-client init registry entry is removed.

- Bump @metamask/wallet 6->7 (bundles transaction-controller 68.2.2).
- Relocate the TransactionController init messenger into wallet-init and
  drop the now-obsolete controller messenger factory.
- Add wallet-init instance-options builder + listener setup for
  TransactionController.
- Resolve the constructed instance via wallet.getInstance.

Author: matthewwalsh0

app/core/Engine/Engine.ts

@@ -129,7 +129,6 @@ import { bridgeControllerInit } from './controllers/bridge-controller/bridge-con
 import { bridgeStatusControllerInit } from './controllers/bridge-status-controller/bridge-status-controller-init';
 import { multichainNetworkControllerInit } from './controllers/multichain-network-controller/multichain-network-controller-init';
 import { currencyRateControllerInit } from './controllers/currency-rate-controller/currency-rate-controller-init';
-import { TransactionControllerInit } from './controllers/transaction-controller';
 import { defiPositionsControllerInit } from './controllers/defi-positions-controller/defi-positions-controller-init';
 import { SignatureControllerInit } from './controllers/signature-controller';
 import { GasFeeControllerInit } from './controllers/gas-fee-controller';
@@ -291,6 +290,7 @@ export class Engine {
     };
 
     this.#wallet = initializeWallet({
+      getState: () => store.getState(),
       messenger: this.controllerMessenger,
       state: mergedInitialState,
     });
@@ -326,7 +326,6 @@ export class Engine {
         GasFeeController: GasFeeControllerInit,
         GatorPermissionsController: GatorPermissionsControllerInit,
         SmartTransactionsController: smartTransactionsControllerInit,
-        TransactionController: TransactionControllerInit,
         TransactionPayController: TransactionPayControllerInit,
         SignatureController: SignatureControllerInit,
         CurrencyRateController: currencyRateControllerInit,
@@ -430,7 +429,9 @@ export class Engine {
     const signatureController = messengerClientsByName.SignatureController;
     const smartTransactionsController =
       messengerClientsByName.SmartTransactionsController;
-    const transactionController = messengerClientsByName.TransactionController;
+    const transactionController = this.#wallet.getInstance(
+      'TransactionController',
+    );
     const seedlessOnboardingController =
       messengerClientsByName.SeedlessOnboardingController;
     const geolocationController = messengerClientsByName.GeolocationController;