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/effects/effectsStore.ts

@@ -8,7 +8,12 @@ function nowMs(): number {
 }
 
 function defaultTool(): EffectToolState {
-  return { tool: 'fog', radiusN: 0.08, intensity: 0.6 };
+  return { tool: 'none', radiusN: 0.08, intensity: 0.6 };
+}
+
+/** Сброс выбранного инструмента (при старте сессии). */
+export function effectsDefaultTool(): EffectToolState {
+  return defaultTool();
 }
 
 export class EffectsStore {