fix: add click-to-copy and etherscan link to block number on success-tx

Block number on the transaction success view now has the same treatment as
addresses and transaction hashes: dashed-underline click-to-copy and an
external link icon linking to etherscan.io/block/{number}.

Closes #99

src/popup/views/txStatus.js

@@ -50,15 +50,6 @@ function toAddressHtml(address) {
     return `<div class="flex items-center">${dot}<span class="break-all underline decoration-dashed cursor-pointer" data-copy="${escapeHtml(address)}">${escapeHtml(address)}</span>${extLink}</div>`;
 }
 
-function txHashHtml(hash) {
-    const link = `https://etherscan.io/tx/${hash}`;
-    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
-    return (
-        `<span class="underline decoration-dashed cursor-pointer break-all" data-copy="${escapeHtml(hash)}">${escapeHtml(hash)}</span>` +
-        extLink
-    );
-}
-
 function blockNumberHtml(blockNumber) {
     const num = String(blockNumber);
     const link = `https://etherscan.io/block/${num}`;
@@ -69,6 +60,15 @@ function blockNumberHtml(blockNumber) {
     );
 }
 
+function txHashHtml(hash) {
+    const link = `https://etherscan.io/tx/${hash}`;
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+    return (
+        `<span class="underline decoration-dashed cursor-pointer break-all" data-copy="${escapeHtml(hash)}">${escapeHtml(hash)}</span>` +
+        extLink
+    );
+}
+
 function attachCopyHandlers(viewId) {
     document
         .getElementById(viewId)