refactor: Move load savegame popup to savegame feature

src/features/savegame/mod.rs

@@ -1,4 +1,5 @@
 use crate::features::phase::components::{SessionTracker, TimerSettings};
+use crate::features::savegame::ui::load_popup_handler;
 use crate::prelude::*;
 use messages::*;
 use std::fs::File;
@@ -6,6 +7,7 @@ use std::io::{Read, Write};
 
 pub mod components;
 pub mod messages;
+pub mod ui;
 
 pub struct SavegamePlugin;
 
@@ -16,6 +18,8 @@ impl Plugin for SavegamePlugin {
 
         app.add_systems(Update, dump_savegame.run_if(in_state(AppState::GameScreen)));
         app.add_systems(Update, load_savegame.run_if(in_state(AppState::GameScreen)));
+
+        app.add_systems(Update, load_popup_handler);
     }
 }