fix: preserve checkbox selection across table re-renders

Snapshot checked row IDs before each innerHTML swap in the virtual hosts,
service tunnels, and server tunnels tables so that periodic refresh cycles
no longer reset multi-selection state.

extension/dashboard/pages/virtual-hosts.js

@@ -34,6 +34,10 @@ function updateConnectionsTable(state) {
     _latencySnapshot[b.dataset.pingHost + ':' + b.dataset.pingPort] = { text: b.textContent, color: b.style.color };
   });
 
+  // Snapshot checked checkboxes so selection survives the innerHTML swap
+  const _checkedHostnames = new Set();
+  tbody.querySelectorAll('.vhost-row-cb:checked').forEach(cb => _checkedHostnames.add(cb.dataset.hostname));
+
   if (virtualHosts.length === 0) {
     tbody.innerHTML = `
       <tr><td colspan="6">
@@ -103,6 +107,7 @@ function updateConnectionsTable(state) {
   });
 
   tbody.querySelectorAll('.vhost-row-cb').forEach(cb => {
+    if (_checkedHostnames.has(cb.dataset.hostname)) cb.checked = true;
     cb.addEventListener('change', _updateVhostBulkBar);
   });