Case C-246/25, Hańczynek: Judgment of the Court (Sixth Chamber) of 30 April 2026 (request for a preliminary ruling from the Sąd Okręgowy w Warszawie – Poland) – AS v BNP Paribas Bank Polska S.A. (Reference for a preliminary ruling – Unfair terms in consumer contracts – Directive 93/13/EEC – Effects of a finding that a term is unfair – Addendum to a mortgage loan agreement – Consequences of the nullity of that addendum on the validity of that contract – Principles of effectiveness and proportionality – Deterrent effect – Conditions for the continued existence of the contract – Obligations of the national court)