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/editor/EditorApp.tsx

@@ -562,11 +562,7 @@ export function EditorApp() {
   const continueImportAfterScenes = useCallback(
     (selections: StorylineSelection[], sceneResolutions: SceneImportResolution[]) => {
       if (!importPeek || !state.project) return;
-      const npcConflicts = computeNpcImportConflicts(
-        state.project,
-        importPeek.sourceProject,
-        selections,
-      );
+      const npcConflicts = computeNpcImportConflicts(state.project, importPeek.sourceProject);
       setPendingImportSelections(selections);
       setPendingSceneResolutions(sceneResolutions);
       setImportConflictsOpen(false);
@@ -578,7 +574,6 @@ export function EditorApp() {
       const npcResolutions = buildNpcResolutionsForImport(
         state.project,
         importPeek.sourceProject,
-        selections,
         [],
         [],
       );
@@ -1459,8 +1454,8 @@ export function EditorApp() {
         storylineLabels={storylineLabels}
         loadStorylines={loadProjectStorylines}
         onClose={() => setExportModalOpen(false)}
-        onExport={async (projectId, selections) => {
-          await actions.exportProject(projectId, selections, storylineLabels);
+        onExport={async (projectId, selections, npcIds) => {
+          await actions.exportProject(projectId, selections, npcIds, storylineLabels);
         }}
       />
       <ImportSourceModal
@@ -1535,7 +1530,6 @@ export function EditorApp() {
           const npcResolutions = buildNpcResolutionsForImport(
             state.project,
             importPeek.sourceProject,
-            pendingImportSelections,
             importNpcConflicts,
             userNpcResolutions,
           );