Add nodes.delete with reauth, activity logs, and Administrators editing.

Allow deleting managed hosts with mandatory inline re-auth, record node mutations in an audit log with a sidebar Logs view, and let Administrators group permissions be edited from the Groups tab.

webui/src/App.css

@@ -60,6 +60,24 @@
   border: none;
 }
 
+.sidebar-logs {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+  padding: 0.5rem 0.75rem 0.75rem;
+  flex-shrink: 0;
+}
+
+.sidebar-category-label {
+  margin: 0 0 0.15rem;
+  padding: 0 0.75rem;
+  font-size: 0.7rem;
+  font-weight: 600;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: var(--ctp-subtext0);
+}
+
 .sidebar-footer {
   display: flex;
   flex-direction: column;
@@ -395,6 +413,21 @@
   cursor: default;
 }
 
+.node-delete {
+  padding: 0.35rem 0.7rem;
+  border: 1px solid var(--ctp-red);
+  border-radius: 6px;
+  background: transparent;
+  color: var(--ctp-red);
+  font: inherit;
+  font-size: 0.85rem;
+  cursor: pointer;
+}
+
+.node-delete:hover {
+  background: color-mix(in srgb, var(--ctp-red) 12%, transparent);
+}
+
 .node-test-result {
   margin: 0;
   font-size: 0.85rem;
@@ -875,3 +908,39 @@
   word-break: break-all;
   font-size: 0.85rem;
 }
+
+.logs-panel {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.logs-filters {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.35rem;
+}
+
+.logs-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.9rem;
+}
+
+.logs-table th,
+.logs-table td {
+  padding: 0.55rem 0.65rem;
+  text-align: left;
+  border-bottom: 1px solid var(--ctp-surface0);
+  vertical-align: top;
+}
+
+.logs-table th {
+  font-weight: 600;
+  color: var(--ctp-subtext0);
+  font-size: 0.8rem;
+}
+
+.logs-table code {
+  font-size: 0.85em;
+}