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/NpcEditModal.tsx

@@ -2,9 +2,8 @@ import React, { useEffect, useMemo, useState } from 'react';
 import { createPortal, flushSync } from 'react-dom';
 
 import { ipcChannels } from '../../shared/ipc/contracts';
-import { noneBinding } from '../../shared/npcs/npcBinding';
 import { buildNpcGroupForest } from '../../shared/npcs/npcGroups';
-import type { NpcBinding, NpcGroupId, Project, ProjectNpc, ProjectNpcGroup } from '../../shared/types';
+import type { NpcGroupId, ProjectNpc, ProjectNpcGroup } from '../../shared/types';
 import editorStyles from '../editor/EditorApp.module.css';
 import {
   filterMaterialImagePaths,
@@ -18,8 +17,6 @@ import { getDndApi } from '../shared/dndApi';
 import { Button, Input, Select } from '../shared/ui/controls';
 import { useAssetUrl } from '../shared/useAssetImageUrl';
 
-import { NpcBindingFields } from './NpcBindingFields';
-
 function normalizeName(input: string): string {
   return input.trim().toLowerCase();
 }
@@ -41,7 +38,6 @@ type NpcEditModalProps = {
   open: boolean;
   initial: ProjectNpc | null;
   existingNames: string[];
-  project: Project | null;
   npcGroups: ProjectNpcGroup[];
   onClose: () => void;
   onPickImage: () => Promise<{ filePath: string; previewDataUrl: string } | null>;
@@ -49,7 +45,6 @@ type NpcEditModalProps = {
     name: string;
     filePath?: string;
     groupId?: NpcGroupId | null;
-    binding?: NpcBinding;
   }) => Promise<void>;
 };
 
@@ -57,7 +52,6 @@ export function NpcEditModal({
   open,
   initial,
   existingNames,
-  project,
   npcGroups,
   onClose,
   onPickImage,
@@ -69,7 +63,6 @@ export function NpcEditModal({
   const [filePath, setFilePath] = useState<string | null>(null);
   const [localPreviewUrl, setLocalPreviewUrl] = useState<string | null>(null);
   const [groupId, setGroupId] = useState<NpcGroupId | ''>('');
-  const [binding, setBinding] = useState<NpcBinding>(noneBinding());
   const [saving, setSaving] = useState(false);
   const [saveProgress, setSaveProgress] = useState<{ percent: number; detail: string } | null>(null);
   const [error, setError] = useState<string | null>(null);
@@ -86,7 +79,6 @@ export function NpcEditModal({
     setFilePath(null);
     setLocalPreviewUrl(null);
     setGroupId(initial?.groupId ?? '');
-    setBinding(initial?.binding ?? noneBinding());
     setSaving(false);
     setSaveProgress(null);
     setError(null);
@@ -261,10 +253,6 @@ export function NpcEditModal({
           {!hasImage ? <div className={editorStyles.fieldError}>{t('npcs.avatarRequired')}</div> : null}
         </div>
 
-        {project && !initial ? (
-          <NpcBindingFields project={project} binding={binding} onChange={setBinding} />
-        ) : null}
-
         {error ? <div className={editorStyles.fieldError}>{error}</div> : null}
 
         <div className={editorStyles.modalFooter}>
@@ -286,7 +274,7 @@ export function NpcEditModal({
                   await onSave({
                     name: trimmed,
                     ...(filePath ? { filePath } : {}),
-                    ...(!initial ? { groupId: groupId || null, binding } : {}),
+                    ...(!initial ? { groupId: groupId || null } : {}),
                   });
                   onClose();
                 } catch (e) {