feat: add game bootstrap for mouse capture handling

src/Godot/Bootstrap/GameBootstrap.cs

@@ -0,0 +1,27 @@
+using Game.Godot.Mappings;
+using Godot;
+
+namespace Game.Godot.Bootstrap;
+
+public partial class GameBootstrap : Node
+{
+    private static void ToggleMouseCapture()
+    {
+        Input.MouseMode = Input.MouseMode == Input.MouseModeEnum.Captured
+            ? Input.MouseModeEnum.Visible
+            : Input.MouseModeEnum.Captured;
+    }
+
+    public override void _Ready()
+    {
+        Input.MouseMode = Input.MouseModeEnum.Captured;
+    }
+
+    public override void _UnhandledInput(InputEvent @event)
+    {
+        if (@event.IsActionPressed(InputAction.Cancel.ActionName()))
+        {
+            ToggleMouseCapture();
+        }
+    }
+}

src/Godot/Bootstrap/GameBootstrap.cs.uid

@@ -0,0 +1 @@
+uid://drctu5y21ey2y