feat: move alert panels next to corresponding charts with scroll

- Replace bottom AlertSection with per-chart AlertPanel
- Each chart row: chart (flex) + alert panel (280px) side by side
- Alert panel matches chart height, scrollable when content overflows

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/page.tsx

@@ -9,7 +9,7 @@ import NetworkChart from '@/components/charts/NetworkChart';
 import NodeTable from '@/components/report/NodeTable';
 import NasTable from '@/components/report/NasTable';
 import NetworkTable from '@/components/report/NetworkTable';
-import AlertSection from '@/components/report/AlertSection';
+import AlertPanel from '@/components/report/AlertPanel';
 import ErrorBoundary from '@/components/ErrorBoundary';
 
 function getDefaultRange() {
@@ -146,15 +146,30 @@ export default function Home() {
           />
         </ErrorBoundary>
 
+        <div className="grid grid-cols-[1fr_280px] gap-4">
           <ErrorBoundary fallback="CPU 차트 오류">
             <TimeSeriesChart title="CPU 사용률" instances={data.metrics.cpu} unit="%" />
           </ErrorBoundary>
+          <ErrorBoundary fallback="CPU 주의 구간 오류">
+            <AlertPanel instances={data.metrics.cpu} type="cpu" height={300} />
+          </ErrorBoundary>
+        </div>
+        <div className="grid grid-cols-[1fr_280px] gap-4">
           <ErrorBoundary fallback="Memory 차트 오류">
             <TimeSeriesChart title="Memory 사용률" instances={data.metrics.memory} unit="%" />
           </ErrorBoundary>
+          <ErrorBoundary fallback="Memory 주의 구간 오류">
+            <AlertPanel instances={data.metrics.memory} type="memory" height={300} />
+          </ErrorBoundary>
+        </div>
+        <div className="grid grid-cols-[1fr_280px] gap-4">
           <ErrorBoundary fallback="Disk 차트 오류">
             <TimeSeriesChart title="Disk 사용률" instances={data.metrics.disk} unit="%" />
           </ErrorBoundary>
+          <ErrorBoundary fallback="Disk 주의 구간 오류">
+            <AlertPanel instances={data.metrics.disk} type="disk" height={300} />
+          </ErrorBoundary>
+        </div>
 
         {data.metrics.nas && data.metrics.nas.length > 0 && (
           <ErrorBoundary fallback="NAS 차트 오류">
@@ -205,16 +220,6 @@ export default function Home() {
           </div>
         </ErrorBoundary>
 
-        <ErrorBoundary fallback="AlertSection 오류">
-          <div>
-            <h2 className="text-lg font-semibold text-gray-800 mb-3">주의 구간</h2>
-            <AlertSection
-              cpu={data.metrics.cpu}
-              memory={data.metrics.memory}
-              disk={data.metrics.disk}
-            />
-          </div>
-        </ErrorBoundary>
       </div>
     </main>
   );

src/components/report/AlertPanel.tsx

@@ -0,0 +1,99 @@
+'use client';
+
+import type { MetricInstance } from '@/types/metrics';
+import { formatTimestamp, formatPercent } from '@/lib/formatters';
+
+interface AlertPanelProps {
+  instances: MetricInstance[];
+  type: 'cpu' | 'memory' | 'disk';
+  height?: number;
+}
+
+interface Alert {
+  level: 'warning' | 'critical';
+  instance: string;
+  message: string;
+}
+
+function generateAlerts(instances: MetricInstance[], type: string): Alert[] {
+  const alerts: Alert[] = [];
+
+  instances.forEach((inst) => {
+    if (type === 'cpu') {
+      if (inst.stats.max > 90) {
+        alerts.push({
+          level: 'critical',
+          instance: inst.instance,
+          message: `최대 ${formatPercent(inst.stats.max)} 도달`,
+        });
+      }
+      inst.peaks.peaks.forEach((peak) => {
+        alerts.push({
+          level: 'warning',
+          instance: inst.instance,
+          message: `${formatTimestamp(peak.startTime)} ~ ${formatTimestamp(peak.endTime)} Peak (max: ${formatPercent(peak.maxValue)})`,
+        });
+      });
+    } else if (type === 'memory') {
+      if (inst.stats.max > 85) {
+        alerts.push({
+          level: inst.stats.max > 95 ? 'critical' : 'warning',
+          instance: inst.instance,
+          message: `최대 ${formatPercent(inst.stats.max)} 도달`,
+        });
+      }
+      inst.peaks.peaks.forEach((peak) => {
+        alerts.push({
+          level: 'warning',
+          instance: inst.instance,
+          message: `${formatTimestamp(peak.startTime)} ~ ${formatTimestamp(peak.endTime)} Peak (max: ${formatPercent(peak.maxValue)})`,
+        });
+      });
+    } else if (type === 'disk') {
+      if (inst.stats.max > 80) {
+        alerts.push({
+          level: inst.stats.max > 90 ? 'critical' : 'warning',
+          instance: inst.instance,
+          message: `사용률 ${formatPercent(inst.stats.max)} (증설 검토 필요)`,
+        });
+      }
+    }
+  });
+
+  return alerts;
+}
+
+export default function AlertPanel({ instances, type, height = 300 }: AlertPanelProps) {
+  const alerts = generateAlerts(instances, type);
+
+  if (alerts.length === 0) {
+    return (
+      <div className="bg-green-50 border border-green-200 rounded-lg p-3 flex items-center justify-center" style={{ height }}>
+        <p className="text-green-700 text-xs">특이사항 없음</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="bg-white border rounded-lg flex flex-col" style={{ height }}>
+      <div className="px-3 py-2 border-b bg-gray-50 flex-shrink-0">
+        <h4 className="text-xs font-medium text-gray-600">주의 구간 ({alerts.length}건)</h4>
+      </div>
+      <ul className="divide-y divide-gray-100 overflow-y-auto flex-1">
+        {alerts.map((alert, idx) => (
+          <li key={idx} className="px-3 py-2 flex items-start gap-2">
+            <span
+              className={`mt-1 inline-block w-1.5 h-1.5 rounded-full flex-shrink-0 ${
+                alert.level === 'critical' ? 'bg-red-500' : 'bg-yellow-500'
+              }`}
+            />
+            <div className="text-xs">
+              <span className="font-medium text-gray-800">{alert.instance}</span>
+              <p className="text-gray-500">{alert.message}</p>
+            </div>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}