refactor(dashboard): add tests for CommitClock peak detection

[JhaSourav07]

🧩 Background

components/dashboard/CommitClock.tsx computes a peakIndex (the day with the most commits) to render the dominant spoke. This logic is currently untested.

🎯 Objective

Extract findPeakIndex(data: CommitClockData[]): number and add unit tests.

📁 Files to touch

• components/dashboard/CommitClock.tsx
• components/dashboard/CommitClock.test.ts (new)

🛠️ Implementation steps

• Extract the helper.
• Test: single item, all equal (first wins), clear winner, all zeros.

✅ Definition of done

• Helper is tested with 4+ cases.
• Component renders identically.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #337 (Similarity: 88.4%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #336 (Similarity: 86.3%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #335 (Similarity: 87.9%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #305 (Similarity: 86.0%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #299 (Similarity: 89.4%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #294 (Similarity: 86.2%).

Please check between these issues and close this one if it is a duplicate.

[Pratikshya32]

Hello @JhaSourav07! /claim