feat(npcs): add campaign NPCs with relation graph and session overlay

Add a dedicated NPC editor window, directed relations, control/presentation avatar overlay, and ru/en help for the new section.

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

app/shared/appBranding.ts

@@ -15,7 +15,15 @@ export function appDisplayNameForLocale(localeTag: string): string {
 /** Префикс заголовка окон: `TTRPG - Редактор`. */
 export const APP_WINDOW_BRAND = 'TTRPG';
 
-export type AppWindowKind = 'editor' | 'presentation' | 'control' | 'boot' | 'sceneDescription' | 'materials';
+export type AppWindowKind =
+  | 'editor'
+  | 'presentation'
+  | 'control'
+  | 'boot'
+  | 'sceneDescription'
+  | 'materials'
+  | 'npcsEditor'
+  | 'npcs';
 
 const WINDOW_SUFFIX: Record<AppWindowKind, { ru: string; en: string }> = {
   editor: { ru: 'Редактор', en: 'Editor' },
@@ -24,6 +32,8 @@ const WINDOW_SUFFIX: Record<AppWindowKind, { ru: string; en: string }> = {
   boot: { ru: 'Загрузка', en: 'Loading' },
   sceneDescription: { ru: 'Описание сцены', en: 'Scene description' },
   materials: { ru: 'Материалы', en: 'Materials' },
+  npcsEditor: { ru: 'НПС', en: 'NPCs' },
+  npcs: { ru: 'НПС', en: 'NPCs' },
 };
 
 export function windowChromeTitle(kind: AppWindowKind, localeTag: string): string {