fix: Declare timezone attr on result_heading

lib/medicode_web/components/components.ex

@@ -73,6 +73,7 @@ defmodule MedicodeWeb.Components do
   attr(:transcription, Medicode.Transcriptions.Transcription, required: true)
   attr(:summary_keywords, :list, default: [])
   attr(:finalized_codes, :list, default: [])
+  attr(:timezone, :string, default: "Etc/UTC")
 
   @doc """
   Shows the status and keywords for the current session.