feat: Load hard-coded savegame file (#37)

src/features/start_screen/mod.rs

@@ -1,4 +1,4 @@
-use crate::prelude::*;
+use crate::{features::savegame::messages::SavegameLoadMessage, prelude::*};
 
 pub struct StartScreenPlugin;
 
@@ -120,6 +120,7 @@ fn menu(
         (&Interaction, &ButtonType, &mut BackgroundColor),
         (Changed<Interaction>, With<Button>),
     >,
+    mut load_messages: MessageWriter<SavegameLoadMessage>,
 ) {
     for (interaction, button_type, mut color) in &mut interaction_query {
         match *interaction {
@@ -127,6 +128,11 @@ fn menu(
                 *color = PRESSED_BUTTON.into();
 
                 match button_type {
+                    ButtonType::LoadGame => {
+                        commands.insert_resource(SavegamePath::new("savegame.json"));
+                        next_state.set(AppState::GameScreen);
+                        load_messages.write(SavegameLoadMessage);
+                    }
                     ButtonType::NewGame => {
                         commands.insert_resource(SavegamePath::new("savegame.json"));
                         next_state.set(AppState::GameScreen);