Refactor PowerPagesChatParticipantConstants and CreateSiteCommand

- Add NL2SITE_GENERATING_SITE constant for generating a new Power Pages site
- Update progress message in CreateSiteCommand to use NL2SITE_GENERATING_SITE constant
- Remove unnecessary markdown formatting in CreateSiteHelper error handling

src/common/chat-participants/powerpages/PowerPagesChatParticipantConstants.ts

@@ -56,3 +56,4 @@ export const NL2PAGE_SCOPE = 'Page';
 export const NL2SITE_REQUEST_FAILED = vscode.l10n.t('Failed to get site content from NL2Site service');
 export const NL2PAGE_GENERATING_WEBPAGES = vscode.l10n.t("Generating webpages...");
 export const NL2PAGE_RESPONSE_FAILED = 'Failed to get page content from NL2Page service';
+export const NL2SITE_GENERATING_SITE = vscode.l10n.t("Generating a new Power Pages site...");

src/common/chat-participants/powerpages/commands/create-site/CreateSiteCommand.ts

@@ -6,13 +6,14 @@
 import { Command } from "../../../CommandRegistry";
 import * as vscode from 'vscode';
 import { createSite } from "./CreateSiteHelper";
+import { NL2SITE_GENERATING_SITE } from "../../PowerPagesChatParticipantConstants";
 
 export class CreateSiteCommand implements Command {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     async execute(request: any, stream: vscode.ChatResponseStream): Promise<any> {
         const { prompt, intelligenceAPIEndpointInfo, intelligenceApiToken, powerPagesAgentSessionId, telemetry } = request;
 
-        stream.progress('Generating a new Power Pages site...');
+        stream.progress(NL2SITE_GENERATING_SITE);
         try {
             // eslint-disable-next-line @typescript-eslint/no-unused-vars
             const result = await createSite(

src/common/chat-participants/powerpages/commands/create-site/CreateSiteHelper.ts

@@ -20,7 +20,7 @@ export const createSite = async (intelligenceEndpoint: string, intelligenceApiTo
         };
 
     } catch (error) {
-        stream.markdown(`Error: ${(error as Error).message}`);
+        stream.markdown(`${(error as Error).message}`);
         throw error;
     }
 };