B2B-88: add starter kit structure and elements

app/(marketing)/_components/site-header-account-section.tsx

@@ -0,0 +1,88 @@
+'use client';
+
+import dynamic from 'next/dynamic';
+import Link from 'next/link';
+
+import { useQuery } from '@tanstack/react-query';
+
+import { PersonalAccountDropdown } from '@kit/accounts/personal-account-dropdown';
+import { useSignOut } from '@kit/supabase/hooks/use-sign-out';
+import { useSupabase } from '@kit/supabase/hooks/use-supabase';
+import { Button } from '@kit/ui/button';
+import { If } from '@kit/ui/if';
+import { Trans } from '@kit/ui/trans';
+
+import featuresFlagConfig from '~/config/feature-flags.config';
+import pathsConfig from '~/config/paths.config';
+
+const ModeToggle = dynamic(() =>
+  import('@kit/ui/mode-toggle').then((mod) => ({
+    default: mod.ModeToggle,
+  })),
+);
+
+const paths = {
+  home: pathsConfig.app.home,
+};
+
+const features = {
+  enableThemeToggle: featuresFlagConfig.enableThemeToggle,
+};
+
+export function SiteHeaderAccountSection() {
+  const session = useSession();
+  const signOut = useSignOut();
+
+  if (session.data) {
+    return (
+      <PersonalAccountDropdown
+        showProfileName={false}
+        paths={paths}
+        features={features}
+        user={session.data.user}
+        signOutRequested={() => signOut.mutateAsync()}
+      />
+    );
+  }
+
+  return <AuthButtons />;
+}
+
+function AuthButtons() {
+  return (
+    <div className={'animate-in fade-in flex gap-x-2.5 duration-500'}>
+      <div className={'hidden md:flex'}>
+        <If condition={features.enableThemeToggle}>
+          <ModeToggle />
+        </If>
+      </div>
+
+      <div className={'flex gap-x-2.5'}>
+        <Button className={'hidden md:block'} asChild variant={'ghost'}>
+          <Link href={pathsConfig.auth.signIn}>
+            <Trans i18nKey={'auth:signIn'} />
+          </Link>
+        </Button>
+
+        <Button asChild className="text-xs md:text-sm" variant={'default'}>
+          <Link href={pathsConfig.auth.signUp}>
+            <Trans i18nKey={'auth:signUp'} />
+          </Link>
+        </Button>
+      </div>
+    </div>
+  );
+}
+
+function useSession() {
+  const client = useSupabase();
+
+  return useQuery({
+    queryKey: ['session'],
+    queryFn: async () => {
+      const { data } = await client.auth.getSession();
+
+      return data.session;
+    },
+  });
+}