fix: the recipient warning says what it checked and skips addresses that have received ETH (closes #528)

The transaction count the node reports is what an address has sent, so
an address that only receives, such as a savings address, got the "ZERO
transaction history" box on every send. The check now also asks the node
for the recipient's balance and warns only when both are zero. The box
says the address has never sent a transaction and holds no ETH, naming
the active network's native token as the contract warning does.

Model: opus-5-5

tests/rpcErrorLog.test.js

@@ -74,7 +74,7 @@ test("ethers puts the URL in the error message, not in the short message", async
 test("the recipient checks before a send", async () => {
     await getFullWarnings(ADDRESS, getProvider(RPC_URL, "mainnet"));
     expectFailureLoggedWithoutKey("contract check failed");
-    expectFailureLoggedWithoutKey("tx count check failed");
+    expectFailureLoggedWithoutKey("tx count or balance check failed");
 });
 
 test("the ENS reverse lookup", async () => {