[Spec 650] Team page: show issue/PR details and activity feed

[waleedkadous]

Summary

• Expand team page member cards to show individual issue/PR titles with clickable GitHub links (replacing count-only display)
• Add combined activity feed showing recent merged PRs and closed issues across all members
• Minimal backend fix: add url to GraphQL query for recent activity items

Changes

• team-github.ts: Add url to merged PR and closed issue GraphQL fragments + types + parsing
• api.ts: Update frontend TeamMemberGitHubData type with url on activity items
• TeamView.tsx: Expand MemberCard with issue/PR title lists; add ActivityFeed component with relativeDate helper
• index.css: Styles for item lists, truncation, activity feed layout
• team-github.test.ts: Add explicit url assertions for recent activity
• activityFeed.test.ts: 8 new tests for relativeDate and buildActivityFeed

Testing

• All unit tests passing (80 backend + 8 dashboard)
• Build passes
• TypeScript clean

Spec

Link: codev/specs/650-team-page-show-issue-pr-detail.md

Review

Link: codev/reviews/650-team-page-show-issue-pr-detail.md

[waleedkadous]

Architect Review

Nice work — clean implementation that makes good use of data we were already fetching.

What changed:

• Member cards now show clickable issue/PR titles instead of just counts
• New activity feed section aggregates merged PRs and closed issues across all members
• Minimal backend fix adds url to GraphQL fragments for recent activity (correct catch from consultation)
• Pure functions (relativeDate, buildActivityFeed) cleanly separated and tested

Looks good. Go ahead and merge.