allow announcement to play when there's no sound for user action required from chat (microsoft#250655)

fixes microsoft#250643

Author: meganrogge

src/vs/workbench/contrib/chat/browser/languageModelToolsService.ts

@@ -380,9 +380,11 @@ export class LanguageModelToolsService extends Disposable implements ILanguageMo
 		if (autoApproved) {
 			return;
 		}
-		const setting: { sound: 'auto' | 'on' | 'off' } = this._configurationService.getValue(AccessibilitySignal.chatUserActionRequired.settingsKey);
-		if (setting.sound === 'on' || (setting.sound === 'auto' && (this._accessibilityService.isScreenReaderOptimized() || !hasFocusedWindow))) {
-			this._accessibilitySignalService.playSignal(AccessibilitySignal.chatUserActionRequired, { customAlertMessage: this._instantiationService.invokeFunction(getToolConfirmationAlert, toolInvocations), userGesture: true });
+		const setting: { sound: 'auto' | 'on' | 'off'; announcement: 'auto' | 'off' } = this._configurationService.getValue(AccessibilitySignal.chatUserActionRequired.settingsKey);
+		const soundEnabled = setting.sound === 'on' || (setting.sound === 'auto' && (this._accessibilityService.isScreenReaderOptimized() || !hasFocusedWindow));
+		const announcementEnabled = this._accessibilityService.isScreenReaderOptimized() && setting.announcement === 'auto';
+		if (soundEnabled || announcementEnabled) {
+			this._accessibilitySignalService.playSignal(AccessibilitySignal.chatUserActionRequired, { customAlertMessage: this._instantiationService.invokeFunction(getToolConfirmationAlert, toolInvocations), userGesture: true, modality: !soundEnabled ? 'announcement' : undefined });
 		}
 	}