Add zoom function

man it took me so long to find out that Rust has a `ref` keyword lol

src/lib.rs

@@ -5,7 +5,7 @@ use clap::Parser;
 
 mod game;
 use game::{
-    runtime::{move_camera, move_player, quit},
+    runtime::{move_camera, move_player, quit, zoom_camera},
     seed::Seed,
     setup::{setup_balls, setup_player, setup_pseudo_random, setup_ui, setup_walls},
 };
@@ -44,7 +44,11 @@ impl Plugin for AppSettings {
             )
             .add_systems(
                 Update,
-                (move_player, quit.run_if(input_pressed(KeyCode::KeyQ))),
+                (
+                    move_player,
+                    quit.run_if(input_pressed(KeyCode::KeyQ)),
+                    zoom_camera,
+                ),
             )
             .add_systems(PostUpdate, move_camera);
     }