feat: add plasma gun weapon implementation and new pause menu system with loadout management

ui/pause_menu.gd

@@ -3,6 +3,7 @@ extends CanvasLayer
 var bg: ColorRect
 var main_vbox: VBoxContainer
 var resume_btn: Button
+var respawn_btn: Button
 var loadouts_btn: Button
 var settings_btn: Button
 var exit_btn: Button
@@ -66,6 +67,10 @@ func _resume() -> void:
 	get_tree().paused = false
 	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
 
+func _respawn() -> void:
+	_resume() # Unpause
+	get_tree().reload_current_scene()
+
 func _build_ui() -> void:
 	bg = ColorRect.new()
 	bg.color = Color(0, 0, 0, 0.7)
@@ -92,6 +97,11 @@ func _build_ui() -> void:
 	resume_btn.custom_minimum_size = Vector2(200, 50)
 	main_vbox.add_child(resume_btn)
 	
+	respawn_btn = Button.new()
+	respawn_btn.text = "Respawn"
+	respawn_btn.custom_minimum_size = Vector2(200, 50)
+	main_vbox.add_child(respawn_btn)
+	
 	loadouts_btn = Button.new()
 	loadouts_btn.text = "Loadouts"
 	loadouts_btn.custom_minimum_size = Vector2(200, 50)
@@ -250,6 +260,7 @@ func _create_label(text: String) -> Label:
 
 func _connect_signals() -> void:
 	resume_btn.pressed.connect(_resume)
+	respawn_btn.pressed.connect(_respawn)
 	loadouts_btn.pressed.connect(_show_loadouts)
 	settings_btn.pressed.connect(_show_settings)
 	exit_btn.pressed.connect(_show_exit_dialog)