feat: add manual refresh button to dashboard header

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

src/components/Dashboard.js

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState } from 'react';
-import useSWR from 'swr';
+import useSWR, { useSWRConfig } from 'swr';
 import NodeList from './NodeList';
 import VMList from './VMList';
 import LXCList from './LXCList';
@@ -94,6 +94,15 @@ export default function Dashboard() {
     window.open(vm.consoleUrl, '_blank');
   };
 
+  const { mutate } = useSWRConfig();
+  const [isRefreshing, setIsRefreshing] = useState(false);
+
+  const handleRefresh = async () => {
+    setIsRefreshing(true);
+    await mutate(['/api/nodes', '/api/vms', '/api/lxc', '/api/status']);
+    setIsRefreshing(false);
+  };
+
   return (
     <div className="min-h-screen p-4 sm:p-6 lg:p-8">
       {/* Header */}
@@ -105,6 +114,13 @@ export default function Dashboard() {
             {new Date().toLocaleTimeString()}
           </p>
         </div>
+        <button
+          onClick={handleRefresh}
+          disabled={isRefreshing}
+          className="self-start rounded-md border border-border-card bg-bg-card px-3 py-1.5 text-sm font-medium text-text-secondary hover:border-accent hover:text-accent disabled:opacity-50"
+        >
+          {isRefreshing ? 'Refreshing…' : '↻ Refresh'}
+        </button>
       </div>
 
       {/* Summary Cards */}