fix(landing): prevent mobile auth modal from unmounting on open

Remove setMobileMenuOpen(false) from mobile AuthModal button onClick
handlers. Closing the mobile menu unmounts the AuthModal before it
can open. The modal overlay or page redirect makes the menu
irrelevant without needing to explicitly close it.

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

Author: waleedlatif1

apps/sim/app/(landing)/components/navbar/navbar.tsx

@@ -350,14 +350,13 @@ export default function Navbar({ logoOnly = false, blogPosts = [] }: NavbarProps
                     <button
                       type='button'
                       className='flex h-[32px] items-center justify-center rounded-[5px] border border-[var(--landing-border-strong)] text-[14px] text-[var(--landing-text)] transition-colors active:bg-[var(--landing-bg-elevated)]'
-                      onClick={() => {
+                      onClick={() =>
                         trackLandingCta({
                           label: 'Log in',
                           section: 'navbar',
                           destination: 'auth_modal',
                         })
-                        setMobileMenuOpen(false)
-                      }}
+                      }
                       aria-label='Log in'
                     >
                       Log in
@@ -367,14 +366,13 @@ export default function Navbar({ logoOnly = false, blogPosts = [] }: NavbarProps
                     <button
                       type='button'
                       className='flex h-[32px] items-center justify-center rounded-[5px] border border-[var(--white)] bg-[var(--white)] text-[14px] text-black transition-colors active:bg-[#E0E0E0]'
-                      onClick={() => {
+                      onClick={() =>
                         trackLandingCta({
                           label: 'Get started',
                           section: 'navbar',
                           destination: 'auth_modal',
                         })
-                        setMobileMenuOpen(false)
-                      }}
+                      }
                       aria-label='Get started with Sim'
                     >
                       Get started