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/addressDetail.js

@@ -4,6 +4,8 @@ const {
     showFlash,
     balanceLinesForAddress,
     addressDotHtml,
+    escapeHtml,
+    formatAddressHtml,
     truncateMiddle,
 } = require("./helpers");
 const { state, currentAddress } = require("../../shared/state");
@@ -76,12 +78,6 @@ function timeAgo(timestamp) {
     return years + " year" + (years !== 1 ? "s" : "") + " ago";
 }
 
-function escapeHtml(s) {
-    const div = document.createElement("div");
-    div.textContent = s;
-    return div.innerHTML;
-}
-
 let loadedTxs = [];
 
 let ensNameMap = new Map();

src/popup/views/approval.js

@@ -1,4 +1,4 @@
-const { $, addressDotHtml } = require("./helpers");
+const { $, formatAddressHtml } = require("./helpers");
 const { state, saveState } = require("../../shared/state");
 
 const runtime =
@@ -14,8 +14,11 @@ function show(id) {
             return;
         }
         $("approve-hostname").textContent = details.hostname;
-        const dot = addressDotHtml(state.activeAddress);
-        $("approve-address").innerHTML = dot + state.activeAddress;
+        $("approve-address").innerHTML = formatAddressHtml(
+            state.activeAddress,
+            null,
+            null,
+        );
         $("approve-remember").checked = state.rememberSiteChoice;
     });
 }

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;
 

src/popup/views/helpers.js

@@ -137,6 +137,27 @@ function addressDotHtml(address) {
     return `<span style="width:8px;height:8px;border-radius:50%;display:inline-block;background:${color};margin-right:4px;vertical-align:middle;flex-shrink:0;"></span>`;
 }
 
+function escapeHtml(s) {
+    const div = document.createElement("div");
+    div.textContent = s;
+    return div.innerHTML;
+}
+
+// Render an address with color dot, optional ENS name, optional truncation.
+// When ensName is provided, shows ENS name (bold) on one line and
+// the address below it. Otherwise shows just the dotted address.
+function formatAddressHtml(address, ensName, maxLen) {
+    const dot = addressDotHtml(address);
+    const displayAddr = maxLen ? truncateMiddle(address, maxLen) : address;
+    if (ensName) {
+        return (
+            `<div class="flex items-center font-bold">${dot}${escapeHtml(ensName)}</div>` +
+            `<div class="break-all">${escapeHtml(displayAddr)}</div>`
+        );
+    }
+    return `<div class="flex items-center">${dot}<span class="break-all">${escapeHtml(displayAddr)}</span></div>`;
+}
+
 module.exports = {
     $,
     showError,
@@ -146,5 +167,7 @@ module.exports = {
     balanceLinesForAddress,
     addressColor,
     addressDotHtml,
+    escapeHtml,
+    formatAddressHtml,
     truncateMiddle,
 };

src/shared/balances.js

@@ -166,44 +166,54 @@ async function lookupTokenInfo(contractAddress, rpcUrl) {
 }
 
 // Derive HD addresses starting from index 0 and check for on-chain activity.
-// Stops after gapLimit consecutive addresses with zero balance and zero tx count.
+// Checks gapLimit addresses in parallel per batch.  Stops when an entire
+// batch has no used addresses (i.e. gapLimit consecutive empty addresses).
 // Returns { addresses: [{ address, index }], nextIndex }.
 async function scanForAddresses(xpub, rpcUrl, gapLimit = 5) {
     log.debugf("scanForAddresses start, gapLimit:", gapLimit);
     const provider = getProvider(rpcUrl);
     const used = [];
-    let gap = 0;
-    let index = 0;
+    let checked = 0;
+    let checkUpTo = gapLimit;
 
-    while (gap < gapLimit) {
-        const addr = deriveAddressFromXpub(xpub, index);
-        let balance, txCount;
-        try {
-            [balance, txCount] = await Promise.all([
-                provider.getBalance(addr),
-                provider.getTransactionCount(addr),
-            ]);
-        } catch (e) {
-            log.errorf(
-                "scanForAddresses check failed",
-                addr,
-                e.shortMessage || e.message,
-            );
-            // Treat RPC failure as empty to avoid infinite loop
-            gap++;
-            index++;
-            continue;
+    while (checked < checkUpTo) {
+        const batch = [];
+        for (let i = checked; i < checkUpTo; i++) {
+            const addr = deriveAddressFromXpub(xpub, i);
+            batch.push({ addr, index: i });
         }
-        if (balance > 0n || txCount > 0) {
-            used.push({ address: addr, index });
-            gap = 0;
-            log.debugf("scanForAddresses used", addr, "index:", index);
-        } else {
-            gap++;
+
+        const results = await Promise.all(
+            batch.map(async ({ addr, index }) => {
+                try {
+                    const [balance, txCount] = await Promise.all([
+                        provider.getBalance(addr),
+                        provider.getTransactionCount(addr),
+                    ]);
+                    return { addr, index, isUsed: balance > 0n || txCount > 0 };
+                } catch (e) {
+                    log.errorf(
+                        "scanForAddresses check failed",
+                        addr,
+                        e.shortMessage || e.message,
+                    );
+                    return { addr, index, isUsed: false };
+                }
+            }),
+        );
+
+        checked = checkUpTo;
+
+        for (const r of results) {
+            if (r.isUsed) {
+                used.push({ address: r.addr, index: r.index });
+                log.debugf("scanForAddresses used", r.addr, "index:", r.index);
+                checkUpTo = Math.max(checkUpTo, r.index + 1 + gapLimit);
+            }
         }
-        index++;
     }
 
+    used.sort((a, b) => a.index - b.index);
     const nextIndex = used.length > 0 ? used[used.length - 1].index + 1 : 1;
     log.infof(
         "scanForAddresses done, found:",