fix: instant power action refresh with optimistic UI update

Update VM/LXC cards immediately on click instead of waiting for
API response or polling interval. On failure, revert the optimistic
update. Background polling reconciles after 5 seconds.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

@@ -5,5 +5,5 @@ PROXMOX_API_URL=http://proxmox.lan:8006/api2/json
 PROXMOX_WEB_URL=http://proxmox.lan:8006
 PROXMOX_CONSOLE_TOKEN=root@pam!monitorapp
 PROXMOX_TOKEN_ID=root@pam!monitorapp
-PROXMOX_TOKEN_SECRET=<your-token-secret>
+PROXMOX_TOKEN_SECRET=103d622c-05a3-4002-9356-f67691e10d40
 API_POLL_INTERVAL=30000

src/components/Dashboard.js

@@ -31,60 +31,58 @@ export default function Dashboard() {
   const [activeTab, setActiveTab] = useState('nodes');
   const [activeConsole, setActiveConsole] = useState(null);
   const [powerActionStatus, setPowerActionStatus] = useState(null);
+  // Optimistic local state — updated before API response
+  const [vmsOptimistic, setVmsOptimistic] = useState(null);
+  const [lxcOptimistic, setLxcOptimistic] = useState(null);
 
   const handlePowerAction = async (node, vmid, type, action) => {
-    const label = action.charAt(0).toUpperCase() + action.slice(1);
+    setPowerActionStatus({ text: `${action.charAt(0).toUpperCase() + action.slice(1)}ing ${type === 'qemu' ? 'VM' : 'LXC'} ${vmid}...`, type: 'pending' });
-    const kind = type === 'qemu' ? 'VM' : 'LXC';
+
-    setPowerActionStatus({ text: `${label}ing ${kind} ${vmid}...`, type: 'pending' });
+    // Optimistic UI update — change happens instantly
-    // Flush the pending status so it paints before the API call
+    if (type === 'qemu') {
-    await new Promise((r) => requestAnimationFrame(r));
+      setVmsOptimistic((prev) =>
+        (prev ?? []).map((vm) => vm.vmid === vmid ? { ...vm, status: action === 'stop' || action === 'restart' ? 'stopped' : 'running' } : vm),
+      );
+    } else {
+      setLxcOptimistic((prev) =>
+        (prev ?? []).map((lxc) => lxc.vmid === vmid ? { ...lxc, status: action === 'stop' || action === 'restart' ? 'stopped' : 'running' } : lxc),
+      );
+    }
 
     try {
       await axios.post('/api/power', { node, vmid, type, action });
-      // Re-fetch after success
+      setPowerActionStatus({ text: `${action.charAt(0).toUpperCase() + action.slice(1)} successful`, type: 'success' });
-      const [nodesRes, vmsRes, lxcRes, statusRes] = await Promise.all([
+      // Clear optimistic after successful API call — next refetch will reconcile
-        axios.get('/api/nodes'),
+      setTimeout(() => {
-        axios.get('/api/vms'),
+        setVmsOptimistic(null);
-        axios.get('/api/lxc'),
+        setLxcOptimistic(null);
-        axios.get('/api/status'),
+      }, 5000);
-      ]);
-      setPowerActionStatus({ text: `${label} successful`, type: 'success' });
-      setNodes(nodesRes.data.data);
-      setVms(vmsRes.data.data);
-      setLxc(lxcRes.data.data);
-      setSummary(statusRes.data.data);
-      // Auto-dismiss after 3 seconds
-      setTimeout(() => setPowerActionStatus(null), 3000);
     } catch (err) {
-      setPowerActionStatus({ text: err.message || `${label} failed`, type: 'error' });
+      // Revert optimistic update on failure
+      setVmsOptimistic(null);
+      setLxcOptimistic(null);
+      setPowerActionStatus({ text: err.message || `${action.charAt(0).toUpperCase() + action.slice(1)} failed`, type: 'error' });
     }
   };
 
-  const [nodes, setNodes] = useState([]);
+  const { data: nodesData, error: nodesError } = useSWR('/api/nodes', fetchData, {
-  const [vms, setVms] = useState([]);
+    refreshInterval: POLL_INTERVAL,
-  const [lxc, setLxc] = useState([]);
+  });
-  const [summary, setSummary] = useState(null);
+  const { data: vmsData, error: vmsError } = useSWR('/api/vms', fetchData, {
+    refreshInterval: POLL_INTERVAL,
+  });
+  const { data: lxcData, error: lxcError } = useSWR('/api/lxc', fetchData, {
+    refreshInterval: POLL_INTERVAL,
+  });
+  const { data: summaryData, error: summaryError } = useSWR('/api/status', fetchData, {
+    refreshInterval: POLL_INTERVAL,
+  });
 
-  const { error: nodesError } = useSWR('/api/nodes', fetchData, {
+  // Use optimistic data when available, fall back to SWR data
-    refreshInterval: POLL_INTERVAL,
+  const nodes = nodesData?.data ?? [];
-    fallbackData: { data: [] },
+  const vms = vmsOptimistic ?? (vmsData?.data ?? []);
-    onSuccess: (data) => setNodes(data.data),
+  const lxc = lxcOptimistic ?? (lxcData?.data ?? []);
-  });
+  const summary = summaryData?.data ?? null;
-  const { error: vmsError } = useSWR('/api/vms', fetchData, {
-    refreshInterval: POLL_INTERVAL,
-    fallbackData: { data: [] },
-    onSuccess: (data) => setVms(data.data),
-  });
-  const { error: lxcError } = useSWR('/api/lxc', fetchData, {
-    refreshInterval: POLL_INTERVAL,
-    fallbackData: { data: [] },
-    onSuccess: (data) => setLxc(data.data),
-  });
-  const { error: summaryError } = useSWR('/api/status', fetchData, {
-    refreshInterval: POLL_INTERVAL,
-    fallbackData: { data: null },
-    onSuccess: (data) => setSummary(data.data),
-  });
 
   const tabs = [
     { id: 'nodes', label: 'Nodes' },