Fix doubled encounters in encounter modals by filtering on gameId

EncounterModal and ShinyEncounterModal were calling useRoutePokemon
without a gameId, returning encounters for all games in the version
group. Now both receive and pass the run's gameId to scope results
to the current game only.

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

frontend/src/components/ShinyEncounterModal.tsx

@@ -9,6 +9,7 @@ import type { Route, RouteEncounterDetail } from '../types'
 
 interface ShinyEncounterModalProps {
   routes: Route[]
+  gameId: number
   onSubmit: (data: {
     routeId: number
     pokemonId: number
@@ -41,6 +42,7 @@ function groupByMethod(pokemon: RouteEncounterDetail[]): { method: string; pokem
 
 export function ShinyEncounterModal({
   routes,
+  gameId,
   onSubmit,
   onClose,
   isPending,
@@ -48,6 +50,7 @@ export function ShinyEncounterModal({
   const [selectedRouteId, setSelectedRouteId] = useState<number | null>(null)
   const { data: routePokemon, isLoading: loadingPokemon } = useRoutePokemon(
     selectedRouteId,
+    gameId,
   )
 
   const [selectedPokemon, setSelectedPokemon] =