fix: a popup reload no longer logs the requests it cancels, except on the transaction detail and confirmation screens (closes #475)

The transaction lists and ENS name lookups on the address and token
screens, the address scan after a wallet is created, the endpoint checks
in Settings, the wait screen's receipt check, the Send screen's Max fee
estimate and the token lookup on both add-token screens now check the
signal the popup aborts on pagehide before reporting a failed request.
scanForAddresses(), resolveEnsNames() and lookupTokenInfo() take the
signal.

End-to-end tests reload the popup on the address screen and during the
address scan with their requests held. Jest tests show each of these
reports a real failure and stays silent once the popup has closed. The
transaction detail and confirmation screens are left out: they discard
the popup context that carries the signal.

Model: opus-5-5

src/popup/views/txStatus.js

@@ -132,6 +132,9 @@ function startWait(txInfo, txHash, broadcastTime, pollNow) {
         try {
             receipt = await provider.getTransactionReceipt(txHash);
         } catch (e) {
+            // Cancelled by the popup closing, not failed: see pageClosed in
+            // src/popup/index.js.
+            if (ctx.pageClosed.aborted) return;
             // A thrown lookup means "no answer this tick", not "no
             // receipt": the RPC failed, the chain said nothing. Declaring
             // the timeout off it would report a confirmed transaction as