update subscription dialog (#6350)

## Summary

- Align with design and new tokens
- Change to point to comfy.org/cloud/pricing

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6350-update-subscription-dialog-29a6d73d365081fc80dbdced405f6b21)
by [Unito](https://www.unito.io)

src/platform/cloud/subscription/components/SubscriptionPanel.vue

@@ -50,7 +50,7 @@
                 v-else
                 :label="$t('subscription.subscribeNow')"
                 size="small"
-                button-class="text-xs"
+                class="text-xs"
                 @subscribed="handleRefresh"
               />
             </div>