Show username under email in member table

app/main.py

@@ -224,7 +224,7 @@ function render(members) {
     const reset = m.reset_at ? m.reset_at.slice(0,10) : '—';
     const pill = m.active ? 'active' : 'inactive';
     return '<tr>' +
-      '<td>' + esc(m.email) + '</td>' +
+      '<td>' + esc(m.email) + (m.username ? '<div style="color:var(--muted);font-size:11px">' + esc(m.username) + '</div>' : '') + '</td>' +
       '<td><span class="pill ' + pill + '">' + pill + '</span></td>' +
       '<td class="num">' + fmt(m.balance) + '</td>' +
       '<td class="num">' + fmt(m.spend) + '</td>' +