Consolidate duration formatting

lib/music_library_web/live/scrobble_live/show.ex

@@ -2,6 +2,7 @@ defmodule MusicLibraryWeb.ScrobbleLive.Show do
   use MusicLibraryWeb, :live_view
 
   alias MusicLibrary.ScrobbleActivity
+  alias MusicLibraryWeb.Duration
 
   @impl true
   def mount(_params, _session, socket) do
@@ -78,14 +79,4 @@ defmodule MusicLibraryWeb.ScrobbleLive.Show do
          )}
     end
   end
-
-  defp format_duration(nil), do: "Unknown"
-
-  defp format_duration(milliseconds) when is_integer(milliseconds) do
-    seconds = div(milliseconds, 1000)
-    minutes = div(seconds, 60)
-    remaining_seconds = rem(seconds, 60)
-
-    "#{minutes}:#{String.pad_leading(Integer.to_string(remaining_seconds), 2, "0")}"
-  end
 end

lib/music_library_web/live/scrobble_live/show.html.heex

@@ -143,7 +143,7 @@
                     :if={track.length}
                     class="text-xs text-gray-500 dark:text-gray-400 font-mono"
                   >
-                    {format_duration(track.length)}
+                    {Duration.format_duration(track.length)}
                   </span>
                 </div>
               </div>