Initial commit

Half-baked state. Most of the UI is mostly done, but the integration
with Grist (or any other data provider) is still missing.

cart_list_entry.gd

@@ -0,0 +1,17 @@
+extends Container
+
+@export var entry: CartEntry
+
+func _ready() -> void:
+	update_info()
+	
+func update_info():
+	%Label.text = "%s (%sg / %.2f€)" % [
+		entry.article_info.text,
+		entry.weight_grams,
+		entry.price_cents / 100.0
+	]
+
+func _on_delete_button():
+	Global.cart.pop_at(entry.cart_index)
+	Global.cart_updated.emit()