Refactor useToast hook

The useToast hook was refactored into smaller, more manageable files to improve code organization and maintainability.

src/hooks/toast/store.ts

@@ -0,0 +1,9 @@
+
+import { State } from './types'
+
+// 전역 상태 및 리스너
+export const listeners: Array<(state: State) => void> = []
+export let memoryState: State = { toasts: [] }
+
+// 마지막 액션 추적 (중복 방지용)
+export let lastAction: { type: string; id?: string; time: number } | null = null