fix(chat): hide empty parts

Author: SisIvanova

src/components/chat/themes/chat.base.scss

@@ -32,6 +32,7 @@ $inline-inset: rem(24px);
     grid-column: 1 / -1;
     grid-template-rows: 1fr auto;
     align-items: start;
+    grid-row: 2;
 }
 
 [part='message-list'],
@@ -120,6 +121,10 @@ $inline-inset: rem(24px);
     margin-inline-end: rem(32px);
 }
 
+igc-chat-input {
+    grid-row: 3;
+}
+
 igc-list {
     --ig-size: 3;
 

src/components/chat/themes/message.base.scss

@@ -38,6 +38,14 @@
     }
 }
 
+[part~='message-header'],
+[part~='message-attachments'],
+[part~='message-actions'] {
+    &:empty {
+      display: none;
+    }
+}
+
 [part~='sent'] {
     margin-inline-start: auto;
     margin-inline-end: unset;