fix: show repository subscriber counts

[nyxsky404]

Summary

Map the repository comparison Watchers metric to GitHub's subscribers_count field instead of the legacy watchers_count field that mirrors stars.

Closes #3350

Type of Change

• Bug fix

What Changed

• Updated the repository comparison API response mapping.

How to Test

1. Compare repositories with different star and subscriber totals.
2. Verify the Watchers value matches GitHub subscriber counts.

Expected result: Stars and Watchers can display different values.

Checklist

• Linked the related issue above
• Self-reviewed my own diff
• No unnecessary debug code
• Focused lint passes locally
• TypeScript check passes locally

Additional Context

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

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[Copilot]

🟢 Ready to approve

The change is small, directly addresses the reported mapping bug, and is consistent with GitHub’s repo field semantics for subscribers/watchers.

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Pull request overview

This PR fixes Repository Comparison’s “Watchers” metric by mapping it to GitHub’s subscribers_count field (the actual watcher/subscriber total) instead of the legacy watchers_count field that mirrors stars.

Changes:

• Update repository comparison data mapping to use subscribers_count for the Watchers value.

File summaries

File	Description
src/app/dashboard/repo-comparison/page.tsx	Maps the displayed Watchers metric to GitHub subscribers_count so Stars and Watchers can differ as expected.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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