Remove left pane width transition

stylesheets/_modules.scss

@@ -6246,12 +6246,6 @@ button.module-image__border-overlay:focus {
       border: 2px solid $color-gray-80;
     }
   }
-
-  @media (prefers-reduced-motion: no-preference) {
-    &:not(.module-left-pane--is-resizing) {
-      transition: width 200ms cubic-bezier(0.17, 0.17, 0, 1);
-    }
-  }
 }
 
 .module-left-pane__empty {

ts/components/LeftPane.tsx

@@ -559,7 +559,10 @@ export const LeftPane: React.FC<PropsType> = ({
                 tabIndex={-1}
               >
                 <ConversationList
-                  dimensions={contentRect.bounds}
+                  dimensions={{
+                    width,
+                    height: contentRect.bounds?.height || 0,
+                  }}
                   getRow={getRow}
                   i18n={i18n}
                   onClickArchiveButton={showArchivedConversations}