fix: history rows show the ISO datetime and the age (closes #760)

Home, AddressDetail and AddressToken showed only the relative age, with
the datetime as a tooltip. Each row now shows the datetime and then the
age in parentheses, on a line of its own, through transactionTimeHtml()
in helpers.js, which TransactionDetail also uses. The direction label
moves to its own right-aligned line below. README.md and docs/README.md
describe the new row.

Model: opus-5-5

tests/timestampDisplay.test.js

@@ -1,15 +1,14 @@
-// A transaction's time is written by isoDate() and timeAgo() in
-// src/popup/views/helpers.js on every screen that shows one (README, Amounts;
-// https://git.eeqj.de/sneak/AutistMask/issues/168). AddressDetail and
-// AddressToken used to define their own copies, so a fix to the shared pair
-// would not have reached them.
+// A transaction's time shows the ISO datetime and the relative age on every
+// screen that shows one (README, Amounts). Home, AddressDetail and AddressToken
+// used to show only the age, with the datetime as a tooltip
+// (https://git.eeqj.de/sneak/AutistMask/issues/760).
 //
-// The pair is replaced before the views are loaded, because a view takes it
-// when it loads. A view that writes the time with a copy of its own shows the
-// real time instead of the replacement.
-//
-// Driven against a minimal DOM stub in the shape
-// tests/contractCreation.test.js uses.
+// The views run against a minimal DOM stub, as in
+// tests/historyAfterNetworkSwitch.test.js, and over
+// tests/support/storageStub.js.
+
+const { makeStorageStub } = require("./support/storageStub");
+const { STATE_SCHEMA_VERSION } = require("../src/shared/stateSchema");
 
 jest.mock("../src/shared/log", () => ({
     log: {
@@ -26,33 +25,78 @@ jest.mock("../src/shared/log", () => ({
 }));
 
 // The history lists ask the explorer for their transactions and resolve ENS
-// names for them; here the explorer answers with mockHistory and no name
+// names for them; here the explorer answers with mockHistory() and no name
 // resolves.
-let mockHistory = [];
 jest.mock("../src/shared/transactions", () => ({
     ...jest.requireActual("../src/shared/transactions"),
-    fetchRecentTransactions: async () => mockHistory,
+    fetchRecentTransactions: async () => mockHistory(),
 }));
 jest.mock("../src/shared/ens", () => ({
     ...jest.requireActual("../src/shared/ens"),
     resolveEnsNames: async () => new Map(),
 }));
 
-globalThis.chrome = {
-    storage: { local: { get: async () => ({}), set: async () => {} } },
-};
-
-const helpers = require("../src/popup/views/helpers");
-jest.spyOn(helpers, "isoDate").mockReturnValue("SHARED-ISO-DATE");
-jest.spyOn(helpers, "timeAgo").mockReturnValue("SHARED-TIME-AGO");
-
-const { state } = require("../src/shared/state");
+const { state, loadState } = require("../src/shared/state");
+const home = require("../src/popup/views/home");
 const addressDetail = require("../src/popup/views/addressDetail");
 const addressToken = require("../src/popup/views/addressToken");
 const transactionDetail = require("../src/popup/views/transactionDetail");
 
 const FROM = "0x0000000000000000000000000000000000000a11";
 const RECIPIENT = "0x66133E8ea0f5D1d612D2502a968757D1048c214a";
+const TIMESTAMP = 1790000000;
+// TIMESTAMP as shown with "UTC Timestamps" on, three hours after it.
+const SHOWN_TIME = "2026-09-21T14:13:20Z (3 hours ago)";
+
+// A profile on Ethereum Mainnet with one address, "Use Blockscout" and "UTC
+// Timestamps" on.
+function profile() {
+    return {
+        schemaVersion: STATE_SCHEMA_VERSION,
+        hasWallet: true,
+        wallets: [
+            {
+                type: "hd",
+                name: "Main",
+                xpub: "xpub-main",
+                encryptedSecret: "encrypted-secret",
+                nextIndex: 1,
+                addresses: [
+                    { address: FROM, balance: "1.0", tokenBalances: [] },
+                ],
+            },
+        ],
+        activeAddress: FROM,
+        networkId: "mainnet",
+        rpcUrl: "https://ethereum-rpc.publicnode.com",
+        blockscoutUrl: "https://eth.blockscout.com/api/v2",
+        useBlockscout: true,
+        utcTimestamps: true,
+    };
+}
+
+// A transfer of ETH from FROM, as Blockscout answers it.
+function mockHistory() {
+    return [
+        {
+            hash: "0x85215772ed26ea8b39c2b3b18779030487efbe0b5fd7e882592b2f62b837be84",
+            blockNumber: 1,
+            from: FROM,
+            to: RECIPIENT,
+            value: "0.0000",
+            exactValue: "0.0",
+            rawAmount: "0",
+            rawUnit: "wei",
+            symbol: "ETH",
+            timestamp: TIMESTAMP,
+            isError: false,
+            directionLabel: "Sent",
+            direction: "sent",
+            contractAddress: null,
+            chainId: "0x1",
+        },
+    ];
+}
 
 function makeElement(id) {
     const el = {
@@ -90,6 +134,7 @@ function makeDocument() {
             return els.get(id);
         },
         createElement: () => makeElement("created"),
+        addEventListener: () => {},
         body: { prepend: () => {} },
     };
 }
@@ -98,64 +143,58 @@ function node(id) {
     return globalThis.document.getElementById(id);
 }
 
-// A transaction FROM sent, as the history lists hold it.
-function historyTx() {
-    return {
-        hash: "0x85215772ed26ea8b39c2b3b18779030487efbe0b5fd7e882592b2f62b837be84",
-        from: FROM,
-        to: RECIPIENT,
-        value: "0.0000",
-        exactValue: "0.0",
-        rawAmount: "0",
-        rawUnit: "wei",
-        symbol: "ETH",
-        timestamp: 1790000000,
-        isError: false,
-        directionLabel: "Sent",
-        direction: "sent",
-        contractAddress: null,
-    };
+// Lets every promise that is not held open settle.
+function settle() {
+    return new Promise((resolve) => setTimeout(resolve, 0));
 }
 
-beforeEach(() => {
+beforeEach(async () => {
+    const storage = makeStorageStub({ autistmask: profile() });
+    globalThis.chrome = {
+        storage: { local: storage.local, onChanged: storage.onChanged },
+    };
     globalThis.document = makeDocument();
     globalThis.window = { location: { search: "" } };
-    state.wallets = [
-        {
-            name: "Main",
-            type: "key",
-            addresses: [{ address: FROM, balance: "0.0000" }],
-        },
-    ];
-    state.trackedTokens = [];
-    state.viewData = {};
+    jest.spyOn(Date, "now").mockReturnValue((TIMESTAMP + 3 * 3600) * 1000);
+    await loadState();
     state.viewStack = [];
-    state.currentView = null;
     state.selectedWallet = 0;
     state.selectedAddress = 0;
     state.selectedToken = "ETH";
-    // The history is Blockscout's.
-    state.useBlockscout = true;
+    const ctx = { pageClosed: new AbortController().signal };
+    addressDetail.init(ctx);
+    addressToken.init(ctx);
+});
+
+afterEach(() => {
+    jest.restoreAllMocks();
+    delete globalThis.chrome;
+    delete globalThis.document;
+    delete globalThis.window;
 });
 
 describe.each([
+    [
+        "Home",
+        "home-tx-list",
+        () => home.render({ pageClosed: new AbortController().signal }),
+    ],
     ["AddressDetail", "tx-list", () => addressDetail.show()],
     ["AddressToken", "address-token-tx-list", () => addressToken.show()],
 ])("a transaction history row on %s", (_name, listId, open) => {
-    test("shows the time written by the shared isoDate() and timeAgo()", async () => {
-        mockHistory = [historyTx()];
+    test("shows the ISO datetime and then the relative age", async () => {
         open();
         // The list is drawn once the history has been fetched.
-        await new Promise((resolve) => setTimeout(resolve, 0));
+        for (let i = 0; i < 10; i++) await settle();
         const html = node(listId).innerHTML;
-        expect(html).toContain('title="SHARED-ISO-DATE"');
-        expect(html).toContain(">SHARED-TIME-AGO<");
+        expect(html).toContain(">" + SHOWN_TIME + "<");
+        expect(html).not.toContain("title=");
     });
 });
 
-test("the transaction detail view shows the time written by the shared isoDate() and timeAgo()", () => {
-    transactionDetail.show(historyTx());
+test("the transaction detail view shows the ISO datetime, copyable, and then the relative age", () => {
+    transactionDetail.show(mockHistory()[0]);
     const html = node("tx-detail-time").innerHTML;
-    expect(html).toContain("SHARED-ISO-DATE");
-    expect(html).toContain("(SHARED-TIME-AGO)");
+    expect(html).toContain('data-copy="2026-09-21T14:13:20Z"');
+    expect(html).toContain(">2026-09-21T14:13:20Z</span> (3 hours ago)");
 });