feat: allow using chat to modify page titles

app/lib/stores/chat.ts

@@ -96,7 +96,7 @@ export class ChatStore {
     });
   }
 
-  addArtifact({ messageId, name, title, id }: ArtifactCallbackData) {
+  async addArtifact({ messageId, name, title, id }: ArtifactCallbackData) {
     const artifact = this.getArtifact(messageId, name);
     if (artifact) {
       return;
@@ -129,6 +129,8 @@ export class ChatStore {
     artifactsByPageName.set(name, newArtifact);
 
     this.artifacts.set(artifactsByMessageId);
+    const bridge = await editorBridge;
+    bridge.updatePageAttributes(name, { title });
   }
 
   updateArtifact({ messageId, name }: ArtifactCallbackData, state: Partial<ArtifactUpdateState>) {

app/lib/stores/pages.ts

@@ -299,6 +299,11 @@ export class PagesStore {
     switch (type) {
       case 'add_page': {
         const { title: pageTitle, actionIds = [] } = payload;
+        const oldPage = this.pages.get()[pageName];
+        if (oldPage) {
+          throw new Error(`Page ${pageName} already exists`);
+        }
+
         this.pages.setKey(pageName, {
           name: pageName,
           title: pageTitle,
@@ -312,10 +317,12 @@ export class PagesStore {
       }
       case 'upsert_page': {
         const { title: pageTitle, actionIds = [] } = payload;
+        const oldPage = this.pages.get()[pageName];
         this.pages.setKey(pageName, {
           name: pageName,
           title: pageTitle,
-          actionIds,
+          actionIds: actionIds || oldPage?.actionIds,
+          content: oldPage?.content,
         });
         break;
       }