fix: the address and token screens and the address scan no longer log requests a popup reload cancels (closes #475)

The transaction lists on the address and token screens, the address scan
after a wallet is created, and the endpoint checks in Settings now check
the signal the popup aborts on pagehide before reporting a failed request,
as the home screen and the balance refresh already do. scanForAddresses()
takes the signal ahead of its gap limit.

End-to-end tests reload the popup on the address screen with Blockscout
held, and during the address scan with its requests held. Jest tests show
the transaction lists, the scan and the Settings checks report a real
failure and stay silent once the popup has closed. The transaction detail
and confirmation screens are left out: they do not keep the popup context.

Model: opus-5-5

tests/settingsEndpointCheck.test.js

@@ -50,7 +50,8 @@ function element(id) {
     return (elements[id] ||= fakeElement());
 }
 
-function loadSettingsView() {
+// `pageClosed` stands in for the popup's: aborting it is the popup closing.
+function loadSettingsView(pageClosed = new AbortController()) {
     elements = {};
     flashes = [];
 
@@ -74,7 +75,9 @@ function loadSettingsView() {
     state.blockscoutUrl = SAVED_BLOCKSCOUT;
     require("../src/shared/log").setRuntimeDebug(true);
 
-    require("../src/popup/views/settings").init({});
+    require("../src/popup/views/settings").init({
+        pageClosed: pageClosed.signal,
+    });
 }
 
 async function save(fieldId, buttonId, typed) {
@@ -146,3 +149,21 @@ test("the Blockscout check of a URL with a user name and password", async () =>
     const line = expectFailedWithoutSecrets("Blockscout validation failed");
     expect(line).toContain("https://explorer.example.invalid");
 });
+
+// In the popup a check its own closing cancelled fails as these do, and is
+// not reported (https://git.eeqj.de/sneak/AutistMask/issues/475). Nothing is
+// saved either.
+test("a check that fails once the popup has closed is not reported", async () => {
+    const pageClosed = new AbortController();
+    pageClosed.abort();
+    loadSettingsView(pageClosed);
+    await save("settings-rpc", "btn-save-rpc", RPC_UNPARSEABLE);
+    await save(
+        "settings-blockscout",
+        "btn-save-blockscout",
+        BLOCKSCOUT_WITH_PASSWORD,
+    );
+    expect(console.error).not.toHaveBeenCalled();
+    expect(state.rpcUrl).toBe(SAVED_RPC);
+    expect(state.blockscoutUrl).toBe(SAVED_BLOCKSCOUT);
+});