Feat: Build contributor activity timeline on public profile

[diksha78dev]

Summary

This PR adds a 90-day contributor activity timeline to public profiles (/@handle page) to highlight contributor consistency over time. It visualizes a user's contribution frequency using a premium client-side CSS grid-based heatmap.

Type of Change

• Bug fix
• New feature
• UI / UX improvement
• Refactor
• Documentation
• Other

Related Issue

Closes #85

What was changed?

• Database Querying: Fetches public-friendly XP events (recommended_merge, unrecommended_merge, and help_review) from xp_events for the last 90 days. Excludes private claimed/skipped events.
• Heatmap Component: Implements a client component ActivityHeatmap (in src/components/activity-heatmap.tsx) that displays a 13-week (91-day) calendar grid styled like GitHub's contribution graph, using tailormade Emerald shade tiers and active tooltips.
• Caching Safety: Bumps the public profile caching key schema to profile:v3:${handle} to prevent type collisions with old cached database structures.
• Public Profile Page: Updates src/app/[handle]/page.tsx to load the timeline data and renders the heatmap below the existing stats cards.

Screenshots

(Heatmap renders visually right under the Stats grid on public profiles, displaying colored active blocks for public merges and reviews.)

Checklist

• My code follows the project structure and conventions
• I tested this locally (npm run dev)
• No hardcoded secrets or credentials
• I have updated documentation if needed

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Project	Deployment	Actions	Updated (UTC)
mergeship	Ready	Preview, Comment	May 22, 2026 2:46pm

[Ayush-Patel-56]

can we add full contribution heatmap here ? Just a suggestion, happy to know the reason behind your current implementation.

[diksha78dev]

@Ayush-Patel-56
The reason I implemented it as a 90-day timeline is because the 'Tech notes' and 'What' sections in the original issue specifically requested fetching the past 90 days.

However, I completely agree that a full 365-day heatmap would look much better! I'd be happy to update the PR to fetch and display the full year if you'd like?

[Ayush-Patel-56]

Yep, would appreciate if you implement full year graph

[diksha78dev]

Ok
i'll implement and update the pr

[diksha78dev]

@Ayush-Patel-56 i have implemented the heatmap graph code kindly review and let me know anything needs ...
Thanks.