Fix: vertical scrolling issue and scrollbar in chat

src/lib/components/chat/conversation.svelte

@@ -130,10 +130,13 @@
     </div>
 </div>
 
-<style>
+<style lang="scss">
     .overflow {
-        overflow: scroll;
+        overflow: auto;
+        scrollbar-width: thin;
+        scrollbar-color: var(--border-neutral, #ededf0) transparent;
     }
+
     section {
         display: flex;
         flex-direction: column;

src/lib/layout/shellStudio.svelte

@@ -466,7 +466,7 @@
     }
 
     .studio-content {
-        min-height: calc(100vh - 48px);
+        min-height: calc(100vh - 54px);
         margin-top: 54px;
         width: 100vw;