fix: guard against non-array os.loadavg() in stats page

Normalize loadAvg to [0,0,0] fallback in both the native host handler
and the dashboard renderer to prevent TypeError when bare-node-os returns
a non-array value for loadavg().

extension/dashboard/pages/stats.js

@@ -165,7 +165,8 @@ function _renderSystemResources(ps) {
   }
   const o = ps.os;
   const usedMem = o.totalMemory - o.freeMemory;
-  const loadColors = o.loadAvg.map(l => l > (o.cpuCount * 0.8) ? 'var(--red)' : l > (o.cpuCount * 0.5) ? 'var(--amber)' : 'var(--green)');
+  const loadAvg = Array.isArray(o.loadAvg) ? o.loadAvg : [0, 0, 0];
+  const loadColors = loadAvg.map(l => l > (o.cpuCount * 0.8) ? 'var(--red)' : l > (o.cpuCount * 0.5) ? 'var(--amber)' : 'var(--green)');
 
   const content = `
     <div style="margin-bottom:14px;">
@@ -178,9 +179,9 @@ function _renderSystemResources(ps) {
     <div style="margin-bottom:14px;">
       <div style="font-size:12px;color:var(--text3);margin-bottom:8px;">CPU Load Average</div>
       <div style="display:flex;gap:8px;flex-wrap:wrap;">
-        ${_statChip('1 min', o.loadAvg[0]?.toFixed(2) ?? '—', loadColors[0])}
-        ${_statChip('5 min', o.loadAvg[1]?.toFixed(2) ?? '—', loadColors[1])}
-        ${_statChip('15 min', o.loadAvg[2]?.toFixed(2) ?? '—', loadColors[2])}
+        ${_statChip('1 min', loadAvg[0]?.toFixed(2) ?? '—', loadColors[0])}
+        ${_statChip('5 min', loadAvg[1]?.toFixed(2) ?? '—', loadColors[1])}
+        ${_statChip('15 min', loadAvg[2]?.toFixed(2) ?? '—', loadColors[2])}
         ${_statChip('Cores', o.cpuCount, 'var(--text2)')}
       </div>
     </div>

native-host/host/message-router.js

@@ -356,7 +356,7 @@ async function handleMessageAsync(send, msg) {
         let arch = '';
         let totalMemory = 0;
         let freeMemory = 0;
-        try { loadAvg = os.loadavg(); } catch (_) {}
+        try { const la = os.loadavg(); loadAvg = Array.isArray(la) ? la : [0, 0, 0]; } catch (_) {}
         try { cpuCount = os.cpus().length; } catch (_) {}
         try { platform = os.platform(); } catch (_) {}
         try { arch = os.arch(); } catch (_) {}