[GOOD FIRST ISSUE] Show total lines of code changed (additions + deletions) in PR Analytics widget

[vbarik317-droid]

Summary
The PR Analytics widget is missing a "Lines Changed" stat — a simple but useful productivity signal. This task adds it as a new stat tile.

What needs to be done

• Fetch additions and deletions from GitHub GraphQL API for merged PRs
• Extend /api/metrics/prs response to include totalAdditions and totalDeletions
• Add a new stat tile in the PR Analytics widget showing: +1,240 / -380
• Color additions green and deletions red (matching GitHub's diff style)

Files to touch

• src/app/api/metrics/prs/ (extend GraphQL query + API response)
• PR Analytics widget component inside src/components/

Hints

• GitHub GraphQL field: pullRequest { additions deletions }
• Only sum values for merged PRs within the selected date range
• Use toLocaleString() to format large numbers nicely

Good for
Someone comfortable with GraphQL and React looking to extend an existing feature.

[vbarik317-droid]

/claim

[srinidhi-2006-bit]

Hi @vbarik317-droid,

I would like to work on this issue under GSSoC'26.

My approach:

• Extend the GitHub GraphQL query to fetch additions and deletions for merged pull requests within the selected date range.
• Update the /api/metrics/prs endpoint to calculate and return totalAdditions and totalDeletions.
• Add a new "Lines Changed" stat tile to the PR Analytics widget displaying additions and deletions in a clear format (e.g., +1,240 / -380).
• Use GitHub-style colors for additions (green) and deletions (red) and format large numbers with toLocaleString().
• Verify the calculations and ensure the new metric integrates smoothly with the existing analytics UI.

I can submit a PR shortly after assignment.

Thank you!

/assign

[github-actions]

Assigned to @srinidhi-2006-bit! You have 7 days to open a PR. No PR after 7 days = auto-unassigned so others can pick it up. Good luck!