Use time.to_duration_string

src/musicplayer/musicplayer.gleam

@@ -1,8 +1,8 @@
 import gleam/erlang/process.{type Name, type Subject}
-import gleam/float
 import gleam/otp/actor
 import gleam/result
 import gleam/string
+import musicplayer/time/time
 
 import musicplayer/control.{type Control}
 import musicplayer/input/key.{type Key}
@@ -85,7 +85,7 @@ fn handle_message(
           process.send(
             state.ui,
             ui_control.UpdateState(
-              "playback time: " <> float.to_string(playback_time),
+              "playback time: " <> time.to_duration_string(playback_time),
             ),
           )
       }