feat: make login button show only on dekstop (#6213)

## Summary

Make login and current user button visible on desktop only. 

## Screenshots (if applicable)

<img width="519" height="162" alt="image"
src="https://github.com/user-attachments/assets/80d86145-2bb9-4396-a02d-dc577192cb17"
/>
<img width="482" height="130" alt="image"
src="https://github.com/user-attachments/assets/cd843611-ce23-4cd4-a864-78cac1c7101f"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6213-feat-make-login-button-show-only-on-dekstop-2956d73d365081eb93f1d5da92dc38ee)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/components/TopMenuSection.vue

@@ -13,8 +13,10 @@
         class="[&:not(:has(*>*:not(:empty)))]:hidden"
       ></div>
       <ComfyActionbar />
-      <LoginButton v-if="!isLoggedIn" />
-      <CurrentUserButton v-else class="shrink-0" />
+      <template v-if="isDesktop">
+        <LoginButton v-if="!isLoggedIn" />
+        <CurrentUserButton v-else class="shrink-0" />
+      </template>
     </div>
   </div>
 </template>
@@ -29,9 +31,11 @@ import LoginButton from '@/components/topbar/LoginButton.vue'
 import { useCurrentUser } from '@/composables/auth/useCurrentUser'
 import { app } from '@/scripts/app'
 import { useWorkspaceStore } from '@/stores/workspaceStore'
+import { isElectron } from '@/utils/envUtil'
 
 const workspaceStore = useWorkspaceStore()
 const { isLoggedIn } = useCurrentUser()
+const isDesktop = isElectron()
 
 // Maintain support for legacy topbar elements attached by custom scripts
 const legacyCommandsContainerRef = ref<HTMLElement>()