fix(dashboard): skip allowlist re-render while input has focus

The polling refresh replaced the entire allowlist panel innerHTML every
2 seconds, destroying the input field mid-typing. Users had to
paste-and-enter faster than the refresh interval — #106 reported this
as text "timing out and erasing."

Guard: skip renderAllowlist() when allowDomainInput has focus.

site/dashboard.html

@@ -1354,6 +1354,7 @@ function renderBlockingInfo(info) {
 }
 
 function renderAllowlist(entries) {
+  if (document.activeElement && document.activeElement.id === 'allowDomainInput') return;
   const el = document.getElementById('blockingAllowlist');
   const count = entries.length;
   el.innerHTML = `