Distinguish in-place progress updates from new phase messages

reportProgress passes an update flag through the callback chain so the
UI updates the existing line in place. reportStart/reportSuccess/emitProgress
create new lines, matching the terminal spinner behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/cli/ai/tests/tools.test.ts

@@ -217,8 +217,8 @@ describe( 'Studio AI MCP tools', () => {
 
 		await getTool( 'preview_create' ).handler( { nameOrPath: 'My Site' } as never, null );
 
-		expect( previousCallback ).toHaveBeenCalledWith( 'Creating preview…' );
-		expect( previousCallback ).toHaveBeenCalledWith( 'Almost done…' );
+		expect( previousCallback ).toHaveBeenCalledWith( 'Creating preview…', undefined );
+		expect( previousCallback ).toHaveBeenCalledWith( 'Almost done…', undefined );
 	} );
 
 	it( 'rejects shell syntax in wp_cli post content before dispatching to WP-CLI', async () => {

apps/cli/ai/tools.ts

@@ -194,9 +194,9 @@ export async function captureCommandOutput( fn: () => Promise< void > ): Promise
 		consoleOutput += args.map( String ).join( ' ' ) + '\n';
 	};
 	process.exitCode = undefined;
-	setProgressCallback( ( message ) => {
+	setProgressCallback( ( message, update ) => {
 		progressMessages.push( message );
-		previousCallback?.( message );
+		previousCallback?.( message, update );
 	} );
 
 	try {

apps/cli/ai/ui.ts

@@ -1323,12 +1323,12 @@ export class AiChatUI {
 
 	private lastProgressText: Text | null = null;
 
-	setLoaderMessage( message: string ): void {
+	setLoaderMessage( message: string, update?: boolean ): void {
 		if ( ! message ) {
 			return;
 		}
 		const formatted = '   ' + chalk.dim( '⎿ ' ) + chalk.dim( message );
-		if ( this.lastProgressText ) {
+		if ( update && this.lastProgressText ) {
 			this.lastProgressText.setText( formatted );
 		} else {
 			this.lastProgressText = new Text( formatted, 0, 0 );

apps/cli/commands/ai/index.ts

@@ -157,9 +157,9 @@ export async function runCommand(
 		);
 	}
 
-	setProgressCallback( ( message ) => {
+	setProgressCallback( ( message, update ) => {
 		const timestamp = new Date().toISOString();
-		ui.setLoaderMessage( message );
+		ui.setLoaderMessage( message, update );
 		void persist( ( recorder ) => recorder.recordToolProgress( message, timestamp ) );
 	} );
 

apps/cli/logger.ts

@@ -2,7 +2,7 @@ import ora, { Ora } from 'ora';
 
 const isIpcMode = Boolean( process.send );
 
-type ProgressCallback = ( message: string ) => void;
+type ProgressCallback = ( message: string, update?: boolean ) => void;
 let progressCallback: ProgressCallback | null = null;
 
 export function setProgressCallback( callback: ProgressCallback | null ): void {
@@ -73,7 +73,7 @@ export class Logger< T extends string > {
 		}
 
 		if ( progressCallback ) {
-			progressCallback!( message );
+			progressCallback!( message, true );
 			return;
 		}