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/index.ts

@@ -29,12 +29,15 @@ import {
 import {
   applyDockIconIfNeeded,
   closeMultiWindow,
+  closeSceneDescriptionWindow,
   createEditorWindowDeferred,
   createWindows,
   focusEditorWindow,
+  getSceneDescriptionContent,
   isMultiWindowOpen,
   markAppQuitting,
   openMultiWindow,
+  openSceneDescriptionWindow,
   togglePresentationFullscreen,
   waitForEditorWindowReady,
 } from './windows/createWindows';
@@ -308,6 +311,17 @@ async function main() {
   registerHandler(ipcChannels.windows.getMultiWindowState, () => {
     return { open: isMultiWindowOpen() };
   });
+  registerHandler(ipcChannels.windows.openSceneDescription, ({ html }) => {
+    openSceneDescriptionWindow(html);
+    return { ok: true };
+  });
+  registerHandler(ipcChannels.windows.closeSceneDescription, () => {
+    closeSceneDescriptionWindow();
+    return { ok: true };
+  });
+  registerHandler(ipcChannels.windows.getSceneDescriptionContent, () => {
+    return { html: getSceneDescriptionContent() };
+  });
 
   registerHandler(ipcChannels.project.list, async () => {
     const projects = await projectStore.listProjects();