Revert "Revert "add rounded border""

This reverts commit cfdbd8012587b07b69b5d30daaf7a1912b156b75.

lua/lvim/core/breadcrumbs.lua

@@ -92,6 +92,9 @@ M.config = function()
           ["<ESC>"] = close_all_menus,
           ["q"] = close_all_menus,
         },
+        win_configs = {
+          border = "rounded",
+        },
       },
     },
   }