Hub art refresh and VS screen polish

Refreshed the hub background art for arena, bazar, library, ormron_street, and teahouse — new higher-resolution back and mid layers, plus a story1 banner asset. Layer naming and parallax wiring are unchanged, so this is purely a look upgrade; the recent trigger layout tuning was dialed against the new art.

The VS popup got a round of tightening. Enemies are now selectable — the showcase and spells track whichever enemy you tap, and the full-size enemy image is mirrored so they face the heroes. First enemy card shifts 50px left and showcase images shrink 20% so everything fits without crowding.

The comic hero card mini drops its name tag and floats stats and status directly over the oval, which reads cleaner at small sizes. Aspects hub renders the hero front image without the oval frame. Info chips got brighter yellow text and now format the round as "TURN **n**".