Add legal consent and reliable external redirects

scripts/ui/donation_screen.gd

@@ -159,6 +159,15 @@ func _build_ui() -> void:
 	var disclosure := _body("Contributions are voluntary, one-time, and not tax-deductible. Card details are entered only on Stripe's secure checkout page.")
 	disclosure.add_theme_font_size_override("font_size", 14)
 	contribution.add_child(disclosure)
+	var legal_links := HBoxContainer.new()
+	legal_links.add_theme_constant_override("separation", 12)
+	contribution.add_child(legal_links)
+	for spec in [["Terms of Service", "terms"], ["Privacy Policy", "privacy"]]:
+		var link := Button.new()
+		link.text = spec[0]
+		link.flat = true
+		link.pressed.connect(_open_legal_document.bind(str(spec[1])))
+		legal_links.add_child(link)
 
 
 func on_show(_payload: Variant = null) -> void:
@@ -173,6 +182,10 @@ func on_hide() -> void:
 	donation_service.stop_polling()
 
 
+func _open_legal_document(kind: String) -> void:
+	main.open_legal_document(kind)
+
+
 static func parse_amount_cents(value: String) -> int:
 	return DonationAmount.parse_cents(value)