feat(frontend): revamp monitor cards and process table

Add a dedicated CPU history chart with per-core live indicators, switch the
network block to a vertical stack with a tighter height cap, and lift process
counts into header pills.

Also make the process list columns sortable, add spacing around the close
button, and extend backend CPU sampling to include per-core usage data.

packages/frontend/src/locales/en-US.json

@@ -689,7 +689,9 @@
     "memoryUsageTitleUnit": "Memory Usage ({unit})",
     "networkSpeedTitleUnit": "Network Speed ({unit})",
     "networkHistoryRecentPoints": "Latest {count} samples",
+    "cpuHistoryRecentPoints": "Latest {count} samples",
     "cpuUsageLabel": "CPU Usage (%)",
+    "cpuCoreLabel": "Core {index}",
     "memoryUsageLabelUnit": "Memory Usage ({unit})",
     "networkDownloadLabelUnit": "Download ({unit})",
     "networkUploadLabelUnit": "Upload ({unit})",

packages/frontend/src/locales/ja-JP.json

@@ -1424,7 +1424,9 @@
         "memoryUsageTitleUnit": "メモリ使用状況 ({unit})",
         "networkSpeedTitleUnit": "ネットワーク速度 ({unit})",
         "networkHistoryRecentPoints": "直近 {count} 件のサンプル",
+        "cpuHistoryRecentPoints": "直近 {count} 件のサンプル",
         "cpuUsageLabel": "CPU使用率 (%)",
+        "cpuCoreLabel": "コア {index}",
         "memoryUsageLabelUnit": "メモリ使用量 ({unit})",
         "networkDownloadLabelUnit": "ダウンロード ({unit})",
         "networkUploadLabelUnit": "アップロード ({unit})",

packages/frontend/src/locales/zh-CN.json

@@ -689,7 +689,9 @@
     "memoryUsageTitleUnit": "内存使用情况 ({unit})",
     "networkSpeedTitleUnit": "网络速度 ({unit})",
     "networkHistoryRecentPoints": "最近 {count} 个采样点",
+    "cpuHistoryRecentPoints": "最近 {count} 个采样点",
     "cpuUsageLabel": "CPU 使用率 (%)",
+    "cpuCoreLabel": "核心 {index}",
     "memoryUsageLabelUnit": "内存使用 ({unit})",
     "networkDownloadLabelUnit": "下载 ({unit})",
     "networkUploadLabelUnit": "上传 ({unit})",