feat: live-refresh Connectivity section and RTT charts every 30s

Add fetchHostInfo() call to the 30-second auto-refresh setInterval loop
for expanded host cards. This ensures the Connectivity table and RTT
charts update in real-time without requiring the user to collapse and
re-expand the host card.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DEimzMv4Q5EjFg3hoiZ69T

hbd/server/templates/plugins.html

@@ -1347,6 +1347,11 @@
         document.querySelectorAll('.host-card:not(.collapsed)').forEach(card => {
           const hostname = card.dataset.hostname;
 
+          fetchHostInfo(hostname).then(data => {
+            infoCache[hostname] = data;
+            renderInfoSection(hostname, data);
+          }).catch(() => {});
+
           card.querySelectorAll('.plugin-accordion:not(.collapsed)').forEach(acc => {
             const pname = acc.dataset.plugin;
             if (!GLANCE_PLUGINS.includes(pname)) {