fix: a popup reload no longer logs the requests it cancels on most 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/settingsAddToken.js

@@ -135,6 +135,7 @@ function init(_ctx) {
                 addr,
                 state.rpcUrl,
                 state.networkId,
+                ctx.pageClosed,
             );
             log.infof("Adding token", info.symbol, addr);
             state.trackedTokens.push({
@@ -152,6 +153,9 @@ function init(_ctx) {
             renderDropdown();
             ctx.doRefreshAndRender();
         } catch (e) {
+            // Cancelled by the popup closing, not failed: see pageClosed in
+            // src/popup/index.js.
+            if (ctx.pageClosed.aborted) return;
             const detail = e.shortMessage || e.message || String(e);
             log.errorf("Adding token failed for", addr, detail);
             // lookupTokenInfo() rejects a contract with a one-line message