Add run dashboard and encounter tracking interface

Run list at /runs shows all runs with status badges. Run dashboard at
/runs/:id displays stats, active team, graveyard, and rule badges.
Encounter tracking at /runs/:runId/encounters shows route list with
status indicators, progress bar, filters, and a modal for logging or
editing encounters with pokemon picker.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/hooks/useGames.ts

@@ -15,10 +15,11 @@ export function useGame(id: number) {
   })
 }
 
-export function useGameRoutes(gameId: number) {
+export function useGameRoutes(gameId: number | null) {
   return useQuery({
     queryKey: ['games', gameId, 'routes'],
-    queryFn: () => getGameRoutes(gameId),
+    queryFn: () => getGameRoutes(gameId!),
+    enabled: gameId !== null,
   })
 }