perf: trim session IPC hot paths and fix clear-effects idle render

Skip full project broadcast on graph/NPC position commits, send session.stateChanged only to consumer windows, and force one Pixi render before stopping the idle ticker so Clear effects actually clears the canvas.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/windows/createWindows.ts

@@ -10,7 +10,7 @@ import { safeConsoleError } from '../safeConsole';
 import { getBootSplashWindow } from './bootWindow';
 import { loadBrandingWindowIcon } from './brandingIcon';
 
-type WindowKind =
+export type WindowKind =
   | 'editor'
   | 'presentation'
   | 'control'
@@ -19,6 +19,15 @@ type WindowKind =
   | 'npcsEditor'
   | 'npcs';
 
+/** Окна, которые реально слушают session.stateChanged (редактор синхронизируется через invoke). */
+export const SESSION_STATE_WINDOW_KINDS: readonly WindowKind[] = [
+  'presentation',
+  'control',
+  'materials',
+  'npcs',
+  'npcsEditor',
+] as const;
+
 const windows = new Map<WindowKind, BrowserWindow>();
 
 let appQuitting = false;
@@ -63,6 +72,23 @@ export function markAppQuitting(): void {
   appQuitting = true;
 }
 
+/** Точечная рассылка в известные окна приложения (без splash / чужих BrowserWindow). */
+export function sendToAppWindows(
+  channel: string,
+  payload: unknown,
+  kinds: readonly WindowKind[] = SESSION_STATE_WINDOW_KINDS,
+): void {
+  for (const kind of kinds) {
+    const win = windows.get(kind);
+    if (!win || win.isDestroyed() || win.webContents.isDestroyed()) continue;
+    try {
+      win.webContents.send(channel, payload);
+    } catch {
+      /* окно могло закрыться между проверкой и send */
+    }
+  }
+}
+
 function quitAppFromEditorClose(): void {
   markAppQuitting();
   app.quit();