✨ (leaderboard): Get data from IndexedDB

Get leaderboard data from IndexedDB using localForage package

src/types/game.d.ts

@@ -1,3 +1,4 @@
 export type Difficulty = 'beginner' | 'intermediate' | 'expert';
 export type CellValue = 'empty' | 'bomb' | number;
 export type GridType = { hidden: boolean; value: CellValue; flag: boolean }[][];
+export type LeaderBoardItem = { date: string; time: `${number | ''}${number}m ${number}${number}s` };