W elcome to Budapest: city of stew, city of pavement squares, city of men in cotton smocks offering brisk muscular relaxation in geothermally heated cubicles. Eleven days on from the profound emotional release of winning the Premier League title it seems fitting Arsenal will approach their season’s endgame in a city that is basically perfect for a restorative summer city break. Saturday afternoon at the Puskas Arena already looks like a twin-track event for Mikel Arteta’s team, an occasion that changes shape according to the angle from which you see it. On one hand, victory against Paris Saint-Germain in the Champions League final would represent the greatest day in Arsenal’s history. On the other, this is an occasion that feels strangely light, fun, celebratory, a free-hit kind of final.…