refactor(market): reuse banking treasury account helper

Drops market's local treasury account lookup in favor of getTreasuryAccountId from the banking lib, re-exported for compatibility.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/lib/market/index.ts

@@ -9,7 +9,14 @@ import {
   resolveAssetId,
   toLockerGridItems,
 } from "@/lib/locker";
-import { applyTransaction, ensurePersonalAccount, getMainCurrencyId } from "@/lib/banking";
+import {
+  applyTransaction,
+  ensurePersonalAccount,
+  getMainCurrencyId,
+  getTreasuryAccountId,
+} from "@/lib/banking";
+
+export { getTreasuryAccountId } from "@/lib/banking";
 
 type PayloadType = Awaited<ReturnType<typeof import("payload").getPayload>>;
 
@@ -218,22 +225,6 @@ export async function creditLockerQuantity(
   })) as unknown as LockerStorage;
 }
 
-/** Resolve the id of the open unit treasury account, if any. */
-export async function getTreasuryAccountId(payload: PayloadType): Promise<number | null> {
-  try {
-    const result = (await payload.find({
-      collection: "bank-accounts",
-      where: { and: [{ accountType: { equals: "treasury" } }, { status: { equals: "open" } }] },
-      limit: 1,
-      depth: 0,
-      overrideAccess: true,
-    })) as unknown as { docs: { id: number }[] };
-    return result.docs[0]?.id ?? null;
-  } catch {
-    return null;
-  }
-}
-
 export interface BuyResult {
   transactionId: number;
   total: number;