fix: force paint before API call so status feedback is visible

- requestAnimationFrame flush lets React paint the "Stopping..."
  message before the async API call begins
- Lists never go empty thanks to fallbackData on all SWR hooks
- State synced on success to keep summary counts in sync

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

src/components/Dashboard.js

@@ -36,6 +36,8 @@ export default function Dashboard() {
     const label = action.charAt(0).toUpperCase() + action.slice(1);
     const kind = type === 'qemu' ? 'VM' : 'LXC';
     setPowerActionStatus({ text: `${label}ing ${kind} ${vmid}...`, type: 'pending' });
+    // Flush the pending status so it paints before the API call
+    await new Promise((r) => requestAnimationFrame(r));
 
     try {
       await axios.post('/api/power', { node, vmid, type, action });
@@ -47,7 +49,6 @@ export default function Dashboard() {
         axios.get('/api/status'),
       ]);
       setPowerActionStatus({ text: `${label} successful`, type: 'success' });
-      // Update local state so summary counts stay in sync until poll
       setNodes(nodesRes.data.data);
       setVms(vmsRes.data.data);
       setLxc(lxcRes.data.data);