Previous Leadership Page UI

[calebyhan]

Motivation

Previous Leadership shows historical senate officers grouped by session. It's a simple display page that reuses the Leadership type and API call with a session filter.

Deliverables

• Build /senators/previous-leadership/page.tsx displaying past leadership grouped by session number
• Each session group has a heading (e.g., "106th Senate") and lists leaders beneath it as smaller cards (name, title)
• Wire to getLeadership() with session parameter — fetch all sessions, group client-side
• No headshots needed for previous leaders (just name and title)

Important Notes

• Depends on Shadcn Setup + Global Layout Shell + Navbar #7 (layout), TypeScript Types + API Client #9 (API client)
• If the API only supports one session at a time, fetch the list of available sessions first, then fetch each — or add a backend endpoint that returns all historical leadership grouped
• Use mock data if backend is not ready