fix(npcs): faster editor open, save progress, black screen crash

Warm and show the NPC window sooner, lazy-load ReactFlow/TipTap, overlay save progress like materials, and fix the undefined controlStyles crash after creating an NPC.

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

app/shared/ipc/contracts.ts

@@ -116,6 +116,7 @@ export const ipcChannels = {
     exportZipProgress: 'project.exportZipProgress',
     scenePreviewImportProgress: 'project.scenePreviewImportProgress',
     materialUpsertProgress: 'project.materialUpsertProgress',
+    npcUpsertProgress: 'project.npcUpsertProgress',
   },
   windows: {
     openMultiWindow: 'windows.openMultiWindow',
@@ -217,6 +218,8 @@ export type MaterialUpsertProgressEvent = {
   detail?: string;
 };
 
+export type NpcUpsertProgressEvent = MaterialUpsertProgressEvent;
+
 export type UpdaterCheckResponse =
   | { outcome: 'not_packaged' }
   | { outcome: 'no_license' }
@@ -260,6 +263,7 @@ export type IpcEventMap = {
   [ipcChannels.project.exportZipProgress]: ZipProgressEvent;
   [ipcChannels.project.scenePreviewImportProgress]: ScenePreviewImportEvent;
   [ipcChannels.project.materialUpsertProgress]: MaterialUpsertProgressEvent;
+  [ipcChannels.project.npcUpsertProgress]: NpcUpsertProgressEvent;
   [ipcChannels.updater.progress]: UpdaterProgressEvent;
 };