feat: add team feature flag (#915)

## Description

Add the ability to feature flag the teams feature via UI.

Also added minor UI changes

## Checklist

- [X] I have tested these changes locally and they work as expected.
- [X] I have added/updated tests that prove the effectiveness of these
changes.
- [X] I have followed the project's coding style guidelines.

apps/web/src/components/(dashboard)/layout/header.tsx

@@ -7,6 +7,7 @@ import { useParams } from 'next/navigation';
 
 import { MenuIcon, SearchIcon } from 'lucide-react';
 
+import { useFeatureFlags } from '@documenso/lib/client-only/providers/feature-flag';
 import type { GetTeamsResponse } from '@documenso/lib/server-only/team/get-teams';
 import { getRootHref } from '@documenso/lib/utils/params';
 import type { User } from '@documenso/prisma/client';
@@ -18,6 +19,7 @@ import { CommandMenu } from '../common/command-menu';
 import { DesktopNav } from './desktop-nav';
 import { MenuSwitcher } from './menu-switcher';
 import { MobileNavigation } from './mobile-navigation';
+import { ProfileDropdown } from './profile-dropdown';
 
 export type HeaderProps = HTMLAttributes<HTMLDivElement> & {
   user: User;
@@ -27,6 +29,10 @@ export type HeaderProps = HTMLAttributes<HTMLDivElement> & {
 export const Header = ({ className, user, teams, ...props }: HeaderProps) => {
   const params = useParams();
 
+  const { getFlag } = useFeatureFlags();
+
+  const isTeamsEnabled = getFlag('app_teams');
+
   const [isCommandMenuOpen, setIsCommandMenuOpen] = useState(false);
   const [isHamburgerMenuOpen, setIsHamburgerMenuOpen] = useState(false);
   const [scrollY, setScrollY] = useState(0);
@@ -41,6 +47,34 @@ export const Header = ({ className, user, teams, ...props }: HeaderProps) => {
     return () => window.removeEventListener('scroll', onScroll);
   }, []);
 
+  if (!isTeamsEnabled) {
+    return (
+      <header
+        className={cn(
+          'supports-backdrop-blur:bg-background/60 bg-background/95 sticky top-0 z-[60] flex h-16 w-full items-center border-b border-b-transparent backdrop-blur duration-200',
+          scrollY > 5 && 'border-b-border',
+          className,
+        )}
+        {...props}
+      >
+        <div className="mx-auto flex w-full max-w-screen-xl items-center justify-between gap-x-4 px-4 md:justify-normal md:px-8">
+          <Link
+            href="/"
+            className="focus-visible:ring-ring ring-offset-background rounded-md focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2"
+          >
+            <Logo className="h-6 w-auto" />
+          </Link>
+
+          <DesktopNav />
+
+          <div className="flex gap-x-4 md:ml-8">
+            <ProfileDropdown user={user} />
+          </div>
+        </div>
+      </header>
+    );
+  }
+
   return (
     <header
       className={cn(
@@ -66,11 +100,11 @@ export const Header = ({ className, user, teams, ...props }: HeaderProps) => {
 
         <div className="flex flex-row items-center space-x-4 md:hidden">
           <button onClick={() => setIsCommandMenuOpen(true)}>
-            <SearchIcon className="h-6 w-6" />
+            <SearchIcon className="text-muted-foreground h-6 w-6" />
           </button>
 
           <button onClick={() => setIsHamburgerMenuOpen(true)}>
-            <MenuIcon className="h-6 w-6" />
+            <MenuIcon className="text-muted-foreground h-6 w-6" />
           </button>
 
           <CommandMenu open={isCommandMenuOpen} onOpenChange={setIsCommandMenuOpen} />