Add Hall of Fame team selection for completed runs

After marking a run as completed, a modal prompts the player to select
which Pokemon (up to 6) entered the Hall of Fame. The selection is stored
as hof_encounter_ids on the run, displayed in the victory banner, and
can be edited later. This lays the foundation for scoping genlocke
retireHoF to only the actual HoF team.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/index.ts

@@ -3,6 +3,7 @@ export { EncounterMethodBadge } from './EncounterMethodBadge'
 export { EncounterModal } from './EncounterModal'
 export { EndRunModal } from './EndRunModal'
 export { GameCard } from './GameCard'
+export { HofTeamModal } from './HofTeamModal'
 export { GameGrid } from './GameGrid'
 export { Layout } from './Layout'
 export { PokemonCard } from './PokemonCard'