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/index.ts

@@ -54,6 +54,7 @@ import {
   closeMaterialsWindow,
   closeNpcsEditorWindow,
   closeNpcsWindow,
+  sendToAppWindows,
   togglePresentationFullscreen,
   waitForEditorWindowReady,
 } from './windows/createWindows';
@@ -229,9 +230,8 @@ function emitSessionState(): void {
     project,
     currentSceneId: project?.currentSceneId ?? null,
   };
-  for (const win of BrowserWindow.getAllWindows()) {
-    win.webContents.send(ipcChannels.session.stateChanged, { state });
-  }
+  // Не шлём полный project в editor/splash — редактор обновляется через invoke-ответы.
+  sendToAppWindows(ipcChannels.session.stateChanged, { state });
 }
 
 /**
@@ -676,8 +676,8 @@ async function main() {
     },
   );
   registerHandler(ipcChannels.project.updateNpcPosition, async ({ npcId, x, y }) => {
+    // Layout-only: Presentation/Control не читают npc.x/y; UI коммитит локально из ответа invoke.
     const project = await projectStore.updateNpcPosition(npcId, x, y);
-    emitSessionState();
     return { project };
   });
   registerHandler(ipcChannels.project.deleteNpc, async ({ npcId }) => {
@@ -811,8 +811,8 @@ async function main() {
     return { project };
   });
   registerHandler(ipcChannels.project.updateSceneGraphNodePosition, async ({ nodeId, x, y }) => {
+    // Layout-only: граф сцен живёт в editor (optimistic + invoke); session broadcast не нужен.
     const project = await projectStore.updateSceneGraphNodePosition(nodeId, x, y);
-    emitSessionState();
     return { project };
   });
   registerHandler(ipcChannels.project.addSceneGraphNode, async ({ sceneId, x, y }) => {