fix: show ERC-20 contract details in address-token view (closes #9)

src/popup/index.html

@@ -358,6 +358,12 @@
                     </div>
                 </div>
 
+                <!-- token contract details (ERC-20 only) -->
+                <div
+                    id="address-token-contract-info"
+                    class="border-b border-border-light pb-2 mb-2 text-xs hidden"
+                ></div>
+
                 <!-- actions -->
                 <div class="flex gap-2 mb-3">
                     <button

src/popup/views/addressToken.js

@@ -130,6 +130,49 @@ function show() {
     // Single token balance line (no tokenId — not clickable here)
     $("address-token-balance").innerHTML = balanceLine(symbol, amount, price);
 
+    // Token contract details (ERC-20 only)
+    const contractInfo = $("address-token-contract-info");
+    if (tokenId !== "ETH") {
+        const tb = (addr.tokenBalances || []).find(
+            (t) => t.address.toLowerCase() === tokenId.toLowerCase(),
+        );
+        const tokenName = tb && tb.name ? escapeHtml(tb.name) : null;
+        const tokenSymbol = tb && tb.symbol ? escapeHtml(tb.symbol) : null;
+        const tokenDecimals = tb && tb.decimals != null ? tb.decimals : null;
+        const tokenHolders = tb && tb.holders != null ? tb.holders : null;
+        const dot = addressDotHtml(tokenId);
+        const tokenLink = `https://etherscan.io/token/${escapeHtml(tokenId)}`;
+        let infoHtml =
+            `<div class="font-bold mb-1">Token Contract</div>` +
+            `<div class="flex items-center mb-1">${dot}` +
+            `<span class="break-all underline decoration-dashed cursor-pointer" id="address-token-contract-copy" data-copy="${escapeHtml(tokenId)}">${escapeHtml(tokenId)}</span>` +
+            `<a href="${tokenLink}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>` +
+            `</div>`;
+        const details = [];
+        if (tokenName)
+            details.push(`<span class="text-muted">Name:</span> ${tokenName}`);
+        if (tokenSymbol)
+            details.push(
+                `<span class="text-muted">Symbol:</span> ${tokenSymbol}`,
+            );
+        if (tokenDecimals != null)
+            details.push(
+                `<span class="text-muted">Decimals:</span> ${tokenDecimals}`,
+            );
+        if (tokenHolders != null)
+            details.push(
+                `<span class="text-muted">Holders:</span> ${Number(tokenHolders).toLocaleString()}`,
+            );
+        if (details.length > 0) {
+            infoHtml += `<div class="flex flex-wrap gap-x-3 gap-y-1">${details.join("")}</div>`;
+        }
+        contractInfo.innerHTML = infoHtml;
+        contractInfo.classList.remove("hidden");
+    } else {
+        contractInfo.innerHTML = "";
+        contractInfo.classList.add("hidden");
+    }
+
     // Transactions
     $("address-token-tx-list").innerHTML =
         '<div class="text-muted text-xs py-1">Loading...</div>';
@@ -252,6 +295,14 @@ function init(_ctx) {
         }
     });
 
+    $("address-token-contract-info").addEventListener("click", (e) => {
+        const copyEl = e.target.closest("[data-copy]");
+        if (copyEl) {
+            navigator.clipboard.writeText(copyEl.dataset.copy);
+            showFlash("Copied!");
+        }
+    });
+
     $("btn-address-token-back").addEventListener("click", () => {
         ctx.showAddressDetail();
     });