Fix missing return and improve error logging

Add missing return in fake plugin getBalance for token balance.
Improve @ts-expect-error comment and log swap quote close errors.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: paullinator

src/core/account/account-api.ts

@@ -768,7 +768,7 @@ export function makeAccountApi(ai: ApiInput, accountId: string): EdgeAccount {
             : undefined,
 
         // Added for backward compatibility for plugins using core 1.x
-        // @ts-expect-error
+        // @ts-expect-error - paymentTokenId/paymentWallet are deprecated but still used by old plugins
         paymentTokenId: paymentInfo?.tokenId,
         paymentWallet: wallet
       })
@@ -796,7 +796,9 @@ export function makeAccountApi(ai: ApiInput, accountId: string): EdgeAccount {
 
       // Close unused quotes:
       for (const otherQuote of otherQuotes) {
-        otherQuote.close().catch(() => undefined)
+        otherQuote.close().catch((error: unknown) => {
+          ai.props.log.warn('Failed to close unused swap quote:', error)
+        })
       }
 
       // Return the front quote:

test/fake/fake-currency-plugin.ts

@@ -217,7 +217,7 @@ class FakeCurrencyEngine implements EdgeCurrencyEngine {
   getBalance(opts: EdgeTokenIdOptions): string {
     const { tokenId = null } = opts
     if (tokenId == null) return this.state.balance.toString()
-    if (tokenId === 'badf00d5') this.state.tokenBalance.toString()
+    if (tokenId === 'badf00d5') return this.state.tokenBalance.toString()
     if (this.allTokens[tokenId] != null) return '0'
     throw new Error('Unknown currency')
   }