Team page: show issue/PR details and activity feed

[waleedkadous]

Summary

The team page currently shows only counts (e.g., "3 issues", "2 PRs") for each member. The backend already fetches full issue/PR titles and URLs via GraphQL, but the frontend discards this data and renders only counts.

Requirements

1. Expanded member cards

Show actual issue/PR titles under each member instead of just counts:

• Working on section: list assigned issue titles (clickable, linking to GitHub)
• Open PRs section: list open PR titles (clickable)
• Recent activity summary: merged/closed counts with "last 7d" label (keep existing)

2. Combined activity feed

Add a third section below Messages — a unified timeline of recent activity across all members:

• Show merged PRs and closed issues from the last 7 days
• Each entry: date, @author, action (merged/closed), #number, title
• Sorted reverse chronologically
• Clickable issue/PR numbers linking to GitHub

Constraints

• Frontend-only change — no backend modifications needed
• All data is already available in TeamMemberGitHubData (assignedIssues, openPRs, recentActivity)
• Files to modify: TeamView.tsx (component) and index.css (styles)
• Keep existing member card info (name, role, GitHub handle)

Scope

• ~200 LOC frontend change
• ASPIR protocol appropriate (low risk, no architectural decisions)