Boss battle cards now collapse the pokemon team by default with a
chevron toggle. Expanded teams show larger sprites with "Lvl" prefix.
In hardcore mode, the BossDefeatModal hides the attempts field and
lost button since a loss ends the run.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Introduces full boss battle system: data models (BossBattle, BossPokemon,
BossResult), API endpoints for CRUD and per-run defeat tracking, and frontend
UI including a sticky level cap bar with badge display on the run page,
interleaved boss battle cards in the encounter list, and an admin panel
section for managing boss battles and their pokemon teams.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
