Parallelize address scanning and unify address display formatting

Scanning: check all gap-limit addresses in parallel per batch instead
of sequentially. For a wallet with 1 used address this reduces from
12 sequential RPC round-trips to 1 parallel batch + 1 small follow-up.

Display: add shared formatAddressHtml(address, ensName, maxLen) and
escapeHtml() to helpers.js. Use them in confirm-tx (was missing color
dot entirely) and approval view. Remove duplicate escapeHtml from
addressDetail.js.

src/popup/views/confirmTx.js

@@ -3,7 +3,13 @@
 // password modal, decrypts secret, signs and broadcasts.
 
 const { parseEther } = require("ethers");
-const { $, showError, hideError, showView } = require("./helpers");
+const {
+    $,
+    showError,
+    hideError,
+    showView,
+    formatAddressHtml,
+} = require("./helpers");
 const { state } = require("../../shared/state");
 const { getSignerForAddress } = require("../../shared/wallet");
 const { decryptWithPassword } = require("../../shared/vault");
@@ -16,16 +22,15 @@ let pendingTx = null;
 function show(txInfo) {
     pendingTx = txInfo;
 
-    $("confirm-from").textContent = txInfo.from;
-    $("confirm-to").textContent = txInfo.to;
+    $("confirm-from").innerHTML = formatAddressHtml(txInfo.from, null, null);
+    $("confirm-to").innerHTML = formatAddressHtml(
+        txInfo.to,
+        txInfo.ensName,
+        null,
+    );
 
-    const ensEl = $("confirm-to-ens");
-    if (txInfo.ensName) {
-        ensEl.textContent = "(" + txInfo.ensName + ")";
-        ensEl.classList.remove("hidden");
-    } else {
-        ensEl.classList.add("hidden");
-    }
+    // Hide the separate ENS element — it's now inline in the address display
+    $("confirm-to-ens").classList.add("hidden");
 
     $("confirm-amount").textContent = txInfo.amount + " " + txInfo.token;