fix: control UX — no default tool, launch loader, NPC layout

Deselect effect tools by default and on re-click, block the editor during session launch, and fix NPC overlay/window empty-state layout.

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

app/main/index.ts

@@ -19,7 +19,7 @@ import {
 } from '../shared/project/projectZipExtension';
 import type { Project } from '../shared/types';
 
-import { EffectsStore } from './effects/effectsStore';
+import { EffectsStore, effectsDefaultTool } from './effects/effectsStore';
 import { SceneDarknessStore } from './effects/sceneDarknessStore';
 import { SceneTrapsStore } from './sceneTraps/sceneTrapsStore';
 import { installIpcRouter, registerHandler, setLicenseAssert } from './ipc/router';
@@ -378,6 +378,7 @@ async function main() {
   registerHandler(ipcChannels.windows.openMultiWindow, () => {
     sceneDarknessStore.resetSession();
     sceneTrapsStore.resetSession();
+    effectsStore.dispatch({ kind: 'tool.set', tool: effectsDefaultTool() });
     openMultiWindow();
     const project = projectStore.getOpenProject();
     if (project) {
@@ -386,6 +387,7 @@ async function main() {
     }
     emitSceneDarknessState();
     emitSceneTrapsState();
+    emitEffectsState();
     return { ok: true };
   });
   registerHandler(ipcChannels.windows.closeMultiWindow, () => {