Dart joins the fight-field animation set

Dart gets idle, selected, attack, hit, KO, KO loop, dance, and celebrate on the fight field — the same set the other four heroes already had. All five main heroes now share one on-grid animation pipeline.

The brief flash heroes used to show at the switch from planning into playout — a beat of nothing between two rendering paths — is gone. The fight-field characters render on the same surface at all times now, so there's no swap and no gap.

Portrait emotions used to sometimes appear late during banter and fight dialogue. Every fight-panel portrait emotion now preloads before the fight reveals, so faces are ready the moment they're needed. Spell-card art also stays in memory when you switch heroes on the loadout screen, so cards don't blank out on the second hero.