perf: diagnoistics improvements

electron/app-metrics.ts

@@ -4,6 +4,10 @@ export interface AppMetricsProcessSnapshot {
   pid: number;
   type: string;
   workingSetKb: number | null;
+  peakWorkingSetKb: number | null;
+  privateBytesKb: number | null;
+  creationTime: number | null;
+  cpuPercent: number | null;
 }
 
 export interface AppMetricsSnapshot {
@@ -17,7 +21,17 @@ export function collectAppMetricsSnapshot(): AppMetricsSnapshot {
     processes: app.getAppMetrics().map((metric) => ({
       pid: metric.pid,
       type: metric.type,
-      workingSetKb: metric.memory?.workingSetSize ?? null
+      workingSetKb: metric.memory?.workingSetSize ?? null,
+      peakWorkingSetKb: readOptionalKilobytes(metric.memory?.peakWorkingSetSize),
+      privateBytesKb: readOptionalKilobytes(metric.memory?.privateBytes),
+      creationTime: metric.creationTime ?? null,
+      cpuPercent: typeof metric.cpu?.percentCPUUsage === 'number'
+        ? Math.round(metric.cpu.percentCPUUsage * 10) / 10
+        : null
     }))
   };
 }
+
+function readOptionalKilobytes(value: number | undefined): number | null {
+  return typeof value === 'number' && value >= 0 ? value : null;
+}