chore: select the first embedded app on tasks page (coder#18260)

The first app might be an external app (shown in the dropdown), and we
actually want to select the first embedded app (which are in tabs).

Author: code-asher

site/src/pages/TaskPage/TaskApps.tsx

@@ -32,8 +32,11 @@ export const TaskApps: FC<TaskAppsProps> = ({ task }) => {
 		.flatMap((a) => a?.apps)
 		.filter((a) => !!a && a.slug !== AI_APP_CHAT_SLUG);
 
+	const embeddedApps = apps.filter((app) => !app.external);
+	const externalApps = apps.filter((app) => app.external);
+
 	const [activeAppId, setActiveAppId] = useState<string>(() => {
-		const appId = apps[0]?.id;
+		const appId = embeddedApps[0]?.id;
 		if (!appId) {
 			throw new Error("No apps found in task");
 		}
@@ -52,9 +55,6 @@ export const TaskApps: FC<TaskAppsProps> = ({ task }) => {
 		throw new Error(`Agent for app ${activeAppId} not found in task workspace`);
 	}
 
-	const embeddedApps = apps.filter((app) => !app.external);
-	const externalApps = apps.filter((app) => app.external);
-
 	return (
 		<main className="flex-1 flex flex-col">
 			<div className="border-0 border-b border-border border-solid w-full p-1 flex gap-2">