feat(scenes): rich scene descriptions and control viewer window

Add TipTap editing in the editor and an Electron window on the control panel to read the current scene description.

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

app/main/ipc/router.ts

@@ -18,6 +18,7 @@ function channelRequiresLicense(channel: string): boolean {
   if (channel.startsWith('license.')) return false;
   if (channel.startsWith('app.')) return false;
   if (channel === ipcChannels.windows.closeMultiWindow) return false;
+  if (channel === ipcChannels.windows.closeSceneDescription) return false;
   if (channel === ipcChannels.windows.togglePresentationFullscreen) return false;
   // Список файлов в %userData%/projects — только чтение; без лицензии список не должен «пропадать».
   if (channel === ipcChannels.project.list) return false;