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/nativeCurrency.test.js

@@ -267,6 +267,13 @@ describe.each([
         );
     });
 
+    test("the warning for a recipient that has never sent a transaction", async () => {
+        await confirmSend("0.1");
+        expect(text("confirm-recipient-warning")).toContain(
+            "has never sent a transaction and holds no " + symbol + ".",
+        );
+    });
+
     // A token reports whatever symbol it likes. One reporting the label the
     // wallet shows its native token under, on this network or any other, is
     // a fake, exactly as one reporting `ETH` always was.