Add pre-commit hooks for linting and formatting

Set up pre-commit framework with ruff (backend) and ESLint/Prettier/tsc
(frontend) hooks to catch issues locally before CI. Auto-format all
frontend files with Prettier to comply with the new check.

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

frontend/src/components/PokemonCard.tsx

@@ -7,8 +7,20 @@ interface PokemonCardProps {
   onClick?: () => void
 }
 
-export function PokemonCard({ encounter, showFaintLevel, onClick }: PokemonCardProps) {
-  const { pokemon, currentPokemon, route, nickname, catchLevel, faintLevel, deathCause } = encounter
+export function PokemonCard({
+  encounter,
+  showFaintLevel,
+  onClick,
+}: PokemonCardProps) {
+  const {
+    pokemon,
+    currentPokemon,
+    route,
+    nickname,
+    catchLevel,
+    faintLevel,
+    deathCause,
+  } = encounter
   const isDead = faintLevel !== null
   const displayPokemon = currentPokemon ?? pokemon
   const isEvolved = currentPokemon !== null