feat(npcs): add groups, storyline bindings, and Foundry import

Nested NPC groups with color, graph filter, and scene/storyline binding; Foundry worlds/modules import actors into groups; storyline merge asks on NPC name conflicts and reports NPC counts.

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

app/renderer/npcs/NpcRelationModal.tsx

@@ -64,11 +64,7 @@ export function NpcRelationModal({ open, initialLabel = '', onClose, onSave }: N
 
         <div className={editorStyles.fieldGrid}>
           <div className={editorStyles.fieldLabel}>{t('npcs.relationLabel')}</div>
-          <Input
-            value={label}
-            onChange={setLabel}
-            placeholder={t('npcs.relationLabelPlaceholder')}
-          />
+          <Input value={label} onChange={setLabel} placeholder={t('npcs.relationLabelPlaceholder')} />
           {trimmed.length < 1 ? (
             <div className={editorStyles.fieldError}>{t('npcs.relationLabelRequired')}</div>
           ) : null}