feat(*): Add 3-2-1 kickoff countdown before play and after goals

Game/scenes/HUD.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=6 format=3 uid="uid://c8kak2l3m4n5"]
+[gd_scene load_steps=7 format=3 uid="uid://c8kak2l3m4n5"]
 
 [ext_resource type="Script" uid="uid://du7y176h5aaq4" path="res://scripts/HUDController.gd" id="1_hud_controller"]
 [ext_resource type="Script" path="res://scripts/hud_attitude_indicator.gd" id="2_adi"]
@@ -8,6 +8,9 @@
 [sub_resource type="LabelSettings" id="LabelSettings_hud"]
 font_size = 32
 
+[sub_resource type="LabelSettings" id="LabelSettings_kickoff"]
+font_size = 96
+
 [node name="HUD" type="CanvasLayer"]
 process_mode = 3
 script = ExtResource("1_hud_controller")
@@ -62,6 +65,24 @@ theme_override_colors/font_color = Color(1, 0.5, 0.15, 1)
 theme_override_font_sizes/font_size = 32
 text = "0"
 
+[node name="KickoffLabel" type="Label" parent="Control"]
+visible = false
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -90.0
+offset_top = -60.0
+offset_right = 90.0
+offset_bottom = 60.0
+grow_horizontal = 2
+grow_vertical = 2
+label_settings = SubResource("LabelSettings_kickoff")
+horizontal_alignment = 1
+vertical_alignment = 1
+
 [node name="ResultOverlay" type="Control" parent="Control"]
 visible = false
 layout_mode = 1