feat: fps counter and limiter

debug/test_level_builder.gd

@@ -12,6 +12,7 @@ var _grapple_icon: TextureRect
 var _dash_icon: TextureRect
 var _grapple_label: Label
 var _dash_label: Label
+var _fps_label: Label
 var _player: CharacterBody3D
 var _debug_ui_panel: PanelContainer
 
@@ -401,12 +402,23 @@ func _build_hud() -> void:
 		crosshair.add_child(line)
 
 	# ── Info panel background ─────────────────────────────────────────────
+	_fps_label = Label.new()
+	_fps_label.name = "FPSLabel"
+	_fps_label.text = "FPS: 0"
+	_fps_label.add_theme_font_size_override("font_size", 24)
+	_fps_label.add_theme_color_override("font_color", Color(0.9, 0.9, 0.2))
+	_fps_label.add_theme_color_override("font_outline_color", Color(0, 0, 0))
+	_fps_label.add_theme_constant_override("outline_size", 4)
+	_fps_label.set_anchors_preset(Control.PRESET_TOP_LEFT)
+	_fps_label.position = Vector2(12, 12)
+	canvas.add_child(_fps_label)
+	
 	_debug_ui_panel = PanelContainer.new()
 	_debug_ui_panel.name = "InfoPanel"
 	_debug_ui_panel.offset_left = 12
-	_debug_ui_panel.offset_top = 12
+	_debug_ui_panel.offset_top = 50
 	_debug_ui_panel.offset_right = 400
-	_debug_ui_panel.offset_bottom = 120
+	_debug_ui_panel.offset_bottom = 160
 	var panel_style := StyleBoxFlat.new()
 	panel_style.bg_color = Color(0, 0, 0, 0.55)
 	panel_style.corner_radius_top_left = 8
@@ -563,6 +575,11 @@ func _process(_delta: float) -> void:
 		
 	if _debug_ui_panel:
 		_debug_ui_panel.visible = SettingsManager.show_debug_ui
+		
+	if _fps_label:
+		_fps_label.visible = SettingsManager.show_fps
+		if _fps_label.visible:
+			_fps_label.text = "FPS: %d" % Engine.get_frames_per_second()
 
 	var vel: Vector3 = _player.velocity
 	var hspeed := Vector2(vel.x, vel.z).length()