Save slots now track the currently-active cutscene file (defaulting to a
new placeholder new_game.jsonc intro) so loading a save resumes it;
cutsceneSystemStartCutsceneWith persists this on every cutscene start, and
a cutsceneSystemLoad ordering bug (loadedFile stamped after starting) is
fixed so the persisted path is always correct. Also adds a
battlefighterspecies_t/battlespeciesid_t stub for upcoming species data.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
