UX: Fixes login/create modal (#24457)

* UX: fix > hide alt login method on mobile create acc

* UX: login modal > fix long names on login buttons

* UX: fix login overflow

app/assets/javascripts/discourse/app/components/modal/create-account.hbs

@@ -280,7 +280,7 @@
         {{loading-spinner size="large"}}
       {{/if}}
     </div>
-    {{#if this.hasAtLeastOneLoginButton}}
+    {{#if (and this.hasAtLeastOneLoginButton this.site.desktopView)}}
       <div class="login-right-side">
         <LoginButtons
           @externalLogin={{this.externalLogin}}

app/assets/stylesheets/common/modal/login-modal.scss

@@ -42,6 +42,7 @@
 
   .login-left-side {
     padding: 3rem;
+    overflow: auto;
   }
 
   .login-welcome-header {

app/assets/stylesheets/mobile/login-modal.scss

@@ -36,7 +36,6 @@
         flex: 1 1 calc(50% - 0.25em);
         font-size: var(--font-down-1);
         white-space: nowrap;
-        max-width: calc(50% - 0.125em);
         &:last-child {
           margin-right: auto;
         }