feat: add contributor growth analytics chart

[jainiksha]

Related Issue

• Closes: 🚀 Feature: Contributor Growth Analytics #720

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Description

Added a Contributor Growth Analytics section to the dashboard. This feature visualizes contribution activity using charts and provides quick insights into Issues, PRs, and overall contribution trends.

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How Has This Been Tested?

• Verified chart rendering with contribution data.
• Checked analytics display for different contribution counts.

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Type of Change

• Bug fix
• New feature
• Code style update
• Breaking change
• Documentation update

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 53f820b and 90d3d8a.

📒 Files selected for processing (1)

• src/components/Dashboard.tsx

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