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/main/project/assetPrune.test.ts

@@ -23,9 +23,10 @@ void test('collectReferencedAssetIds: превью, видео и аудио', (
     },
     campaignAudios: [{ assetId: 'ca1' as AssetId, autoplay: true, loop: true }],
     materials: [{ id: 'm1', name: 'Map', assetId: 'mat1' as AssetId }],
+    npcs: [{ id: 'n1', name: 'Guard', avatarAssetId: 'npc1' as AssetId }],
   } as unknown as Project;
   const s = collectReferencedAssetIds(p);
-  assert.deepEqual([...s].sort(), ['a1', 'ca1', 'mat1', 'pr', 'th', 'v1'].sort());
+  assert.deepEqual([...s].sort(), ['a1', 'ca1', 'mat1', 'npc1', 'pr', 'th', 'v1'].sort());
 });
 
 void test('reconcileAssetFiles: снимает осиротевшие assets и удаляет файлы', async () => {