perf: diagnoistics improvements

electron/diagnostics/immediate-renderer-samples.collector.ts

@@ -0,0 +1,39 @@
+import type { BrowserWindow } from 'electron';
+import type { PerfDiagEntry } from './diagnostics.models';
+
+export async function collectImmediateRendererSamples(
+  window: BrowserWindow | null | undefined
+): Promise<PerfDiagEntry[]> {
+  if (!window || window.isDestroyed()) {
+    return [];
+  }
+
+  try {
+    const result = await window.webContents.executeJavaScript(`
+      (function () {
+        const collect = globalThis.__collectPerfDiagSample;
+
+        return typeof collect === 'function' ? collect() : [];
+      })()
+    `, true);
+
+    if (!Array.isArray(result)) {
+      return [];
+    }
+
+    return result
+      .filter((entry) => entry && typeof entry === 'object')
+      .map((entry) => normalizeImmediateRendererEntry(entry as Partial<PerfDiagEntry>));
+  } catch {
+    return [];
+  }
+}
+
+function normalizeImmediateRendererEntry(entry: Partial<PerfDiagEntry>): PerfDiagEntry {
+  return {
+    collectedAt: Number(entry.collectedAt) || Date.now(),
+    source: 'renderer',
+    type: entry.type ?? 'session',
+    payload: entry.payload ?? {}
+  };
+}