Add timer, move counter, and persistent leaderboard system

[swathiiie]

Feature Proposal: Timer + Leaderboard System

Currently, the Memory Block Game does not track player performance. There is no timer, move counter, or scoring system to measure how well a player performs.

Problem

• No way to measure performance
• No competitive or replay incentive
• No record of best scores
• Limited engagement for repeat players

Proposed Enhancements

Add a Live Timer

• Start timer when the game begins
• Stop timer when all pairs are matched
• Display total completion time

Add Move Counter

• Count every pair attempt
• Display total moves used to complete the game

Add Leaderboard System

• Store top 5 best performances in localStorage
• Rank players based on:
  • Least time
  • Fewest moves
• Display leaderboard in a modal or side panel

[swathiiie]

This enhancement involves state tracking, persistent storage,
win-condition integration, and UI updates.
Requesting re-evaluation for level-2 or level-3 if possible.