chore(release): gate users-branch features for hotfix

Add USERS_BRANCH_FEATURES_ENABLED (off by default) to hide Players library, session tokens, and related UI while keeping the preview import fix. Restore primary Run button when the flag is off.

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

app/renderer/sceneEditor/SceneEditorApp.tsx

@@ -44,6 +44,7 @@ import {
   trapTypeLabelRu,
 } from '../../shared/types/sceneTraps';
 import { sceneViewPanBy, sceneViewZoomAt } from '../../shared/types/sceneView';
+import { USERS_BRANCH_FEATURES_ENABLED } from '../../shared/features/usersBranchFeatures';
 import editorStyles from '../editor/EditorApp.module.css';
 import { useEditorI18n } from '../editor/i18n/EditorI18nContext';
 import { getDndApi } from '../shared/dndApi';
@@ -484,7 +485,7 @@ export function SceneEditorApp() {
       return;
     }
     const npcId = e.dataTransfer.getData(SCENE_NPC_DND_MIME);
-    if (npcId) {
+    if (USERS_BRANCH_FEATURES_ENABLED && npcId) {
       addNpcTokenAt(npcId as NpcId, p.x, p.y);
       return;
     }
@@ -600,6 +601,7 @@ export function SceneEditorApp() {
           ) : null}
         </div>
 
+        {USERS_BRANCH_FEATURES_ENABLED ? (
         <div className={styles.accordion} data-testid="scene-npc-accordion">
           <button type="button" className={styles.accordionHead} onClick={() => setNpcsOpen((v) => !v)}>
             НПС {npcsOpen ? '▾' : '▸'}
@@ -621,6 +623,7 @@ export function SceneEditorApp() {
             </div>
           ) : null}
         </div>
+        ) : null}
 
         <div className={styles.accordion}>
           <button type="button" className={styles.accordionHead} onClick={() => setTokensOpen((v) => !v)}>
@@ -884,7 +887,7 @@ export function SceneEditorApp() {
                   );
                 })
               : null}
-            {contentRect
+            {USERS_BRANCH_FEATURES_ENABLED && contentRect
               ? localNpcTokens.map((tok) => {
                   const npc = project?.npcs.find((item) => item.id === tok.npcId);
                   if (!npc) return null;
@@ -1050,7 +1053,7 @@ export function SceneEditorApp() {
           )
         : null}
 
-      {npcCtxMenu
+      {USERS_BRANCH_FEATURES_ENABLED && npcCtxMenu
         ? createPortal(
             <>
               <button