complete page_3 and setup game menu tabs

core/game_menu/game_menu_tab.gd

@@ -0,0 +1,28 @@
+@tool
+extends Control
+
+class_name GameMenuTab
+
+signal on_tab_selected(index: int)
+
+@export var index: int = 0
+@export var image: Texture:
+	set(value):
+		image = value
+		if is_inside_tree() and has_node("%Texture"):
+			$%Texture.texture_normal = image
+		
+var is_selected: bool  = false
+
+func _ready():
+	if image != null and has_node("%Texture"):
+		$%Texture.texture_normal = image
+
+func _on_texture_pressed() -> void:
+	on_tab_selected.emit(index)
+
+func select():
+	is_selected = true
+
+func deselect():
+	is_selected = false