feat(npcs): drop binding; select NPCs on storyline export

Remove storyline/scene NPC binding and export chosen NPCs with relations/groups. Harden export modal so a missing npcs payload no longer blacks out the editor.

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

app/renderer/npcs/NpcsEditorApp.tsx

@@ -4,7 +4,6 @@ import { createPortal } from 'react-dom';
 import { ipcChannels, type SessionState } from '../../shared/ipc/contracts';
 import { buildNpcGroupForest, type NpcGroupTreeNode } from '../../shared/npcs/npcGroups';
 import type {
-  NpcBinding,
   NpcGroupId,
   NpcId,
   NpcRelationId,
@@ -18,7 +17,6 @@ import { getDndApi } from '../shared/dndApi';
 import { Button, Input, Select } from '../shared/ui/controls';
 import { useAssetUrl } from '../shared/useAssetImageUrl';
 
-import { NpcBindingFields } from './NpcBindingFields';
 import { NpcDescriptionField } from './NpcDescriptionField';
 import { NpcEditModal } from './NpcEditModal';
 import type { GraphGroupFilter } from './NpcGraph';
@@ -822,20 +820,6 @@ export function NpcsEditorApp() {
                   />
                 </div>
 
-                <div>
-                  <div className={styles.fieldLabel}>{t('npcs.bindingEnable')}</div>
-                  <NpcBindingFields
-                    project={project}
-                    binding={selected.binding}
-                    onChange={(binding: NpcBinding) => {
-                      void api.invoke(ipcChannels.project.updateNpcFields, {
-                        npcId: selected.id,
-                        binding,
-                      });
-                    }}
-                  />
-                </div>
-
                 {relationsForSelected.length > 0 ? (
                   <div>
                     <div className={styles.relationsTitle}>{t('npcs.relations')}</div>
@@ -860,7 +844,6 @@ export function NpcsEditorApp() {
         open={editOpen}
         initial={editInitial}
         existingNames={npcs.map((n) => n.name)}
-        project={project}
         npcGroups={npcGroups}
         onClose={() => setEditOpen(false)}
         onPickImage={pickAvatar}
@@ -870,7 +853,6 @@ export function NpcsEditorApp() {
             name: input.name,
             ...(input.filePath ? { filePath: input.filePath } : {}),
             ...(input.groupId !== undefined ? { groupId: input.groupId } : {}),
-            ...(input.binding !== undefined ? { binding: input.binding } : {}),
           });
           const created = res.project.npcs.find((n) => n.name === input.name.trim());
           if (created) setSelectedId(created.id);