Use type PNG badges instead of colored text spans

Replace inline typeColors maps in PokemonCard and StatusChangeModal
with a shared TypeBadge component that renders the type icon PNGs
from /types/{type}.png.

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

frontend/src/components/index.ts

@@ -13,3 +13,4 @@ export { RuleToggle } from './RuleToggle'
 export { RulesConfiguration } from './RulesConfiguration'
 export { StatCard } from './StatCard'
 export { StepIndicator } from './StepIndicator'
+export { TypeBadge } from './TypeBadge'