Add NotificationManager and NotificationLabel for age advancement notifications; refactor scripts into Components directory

Scenes/UI/buff_button.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://b417dl07c13uc"]
+
+[ext_resource type="Script" uid="uid://chnf0t5xdosys" path="res://Scripts/ActiveBuffUi.cs" id="1_7ujuu"]
+
+[node name="BuffButton" type="Button"]
+focus_mode = 0
+disabled = true
+button_mask = 0
+text = "Effect"
+script = ExtResource("1_7ujuu")

Scenes/UI/miracle_button.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://rj1fsdlhju5y"]
+
+[ext_resource type="Script" uid="uid://ctjmwgucwh3le" path="res://Scenes/Main/MiracleButton.cs" id="1_sxcu0"]
+
+[node name="MiracleButton" type="Button"]
+custom_minimum_size = Vector2(128, 64)
+offset_right = 8.0
+offset_bottom = 8.0
+script = ExtResource("1_sxcu0")

Scenes/UI/notification_label.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://crpf0llofg0sc"]
+
+[ext_resource type="Script" uid="uid://drx8lqcjq5khj" path="res://Scripts/NotificationLabel.cs" id="1_x4sn4"]
+
+[node name="NotificationLabel" type="Label"]
+offset_right = 40.0
+offset_bottom = 23.0
+horizontal_alignment = 1
+vertical_alignment = 1
+script = ExtResource("1_x4sn4")