fix(landing): fit account links in narrow mobile menus

Size the account pill segments around their labels and reduce minimum horizontal padding so Start building stays inside its segment on narrow screens.

Author: j15z

apps/sim/app/(landing)/components/navbar/components/navbar-auth-pill/navbar-auth-pill.tsx

@@ -29,7 +29,7 @@ export function NavbarAuthPill({ size = 'compact', className, onNavigate }: Navb
         href={LOGIN_HREF}
         prefetch={false}
         onClick={onNavigate}
-        className={cn(SEGMENT_CLASSES, 'rounded-l-full', compact ? 'px-3' : 'flex-1 px-4')}
+        className={cn(SEGMENT_CLASSES, 'rounded-l-full', compact ? 'px-3' : 'flex-auto px-2')}
       >
         Log in
       </Link>
@@ -41,7 +41,7 @@ export function NavbarAuthPill({ size = 'compact', className, onNavigate }: Navb
         href={SIGNUP_HREF}
         prefetch={false}
         onClick={onNavigate}
-        className={cn(SEGMENT_CLASSES, 'rounded-r-full', compact ? 'px-3' : 'flex-1 px-4')}
+        className={cn(SEGMENT_CLASSES, 'rounded-r-full', compact ? 'px-3' : 'flex-auto px-2')}
       >
         Start building
       </Link>