fix: type safeColor return in ChoreoContext using Kaplay Color type

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

frontend/src/game/fight/types.ts

@@ -26,7 +26,7 @@ export interface ChoreoContext {
   GROUND_Y: number
   FRAME_SIZE: number
   theme: { bg: string; ground: string; accent: string }
-  safeColor: (color: string) => any
+  safeColor: (color: string) => ReturnType<KaplayInstance['Color']['fromHex']>
   trackedTimeout: (fn: () => void, ms: number) => ReturnType<typeof setTimeout>
   trackedInterval: (fn: () => void, ms: number) => ReturnType<typeof setInterval>
   clearTracked: (id: ReturnType<typeof setTimeout>) => void