fix: label swap methods as "Swap" in tx lists, remove unused variable

- Map known DEX methods (execute, swap, multicall, etc.) to "Swap"
  label instead of raw method name like "Execute"
- Remove unused displayData variable in transactionDetail.js

Addresses review feedback on PR #10.

src/popup/views/transactionDetail.js

@@ -188,10 +188,6 @@ async function loadCalldata(txHash, toAddress) {
             const method = txData.method || "Unknown method";
             let html = `<div class="font-bold mb-1">Unknown contract call</div>`;
             html += `<div class="text-muted mb-1">${escapeHtml(method)}</div>`;
-            const displayData =
-                inputData.length > 202
-                    ? inputData.slice(0, 202) + "…"
-                    : inputData;
             html += `<div class="break-all font-mono text-xs">${copyableHtml(inputData, "break-all")}</div>`;
             container.innerHTML = html;
         }