feat: implement Contribution Replay Timeline (Phase 9)

[saidai-bhuvanesh]

Overview

This PR implements Phase 9: Contribution Replay Timeline to introduce an animated timeline scrubbing and playing through historical monthly contributions.

Key Changes

• ContributionReplay Component: Animates accumulated monthly totals, displays monthly grid rhythm view, month navigation buttons, playback speed multiplier controls, and scrub slider.
• DashboardClient Integration: Positioned underneath the historical trend view section.
• Tests: Created ContributionReplay.test.tsx to verify speed multiplier scaling, timer ticks, reset controls, and manual scrub navigation.

Fixes #6217

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[github-actions]

👋 Hey @saidai-bhuvanesh! Thanks for your interest in contributing to CommitPulse! 🙏

Unfortunately, this PR has been automatically closed because you are not assigned to the linked issue #6217 — feat(dashboard): implement Contribution Replay Timeline (Phase 9).

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