fix(members): link sponsors to bills and fix member search

- Poller now fetches bill detail on insert to get sponsor (list endpoint
  has no sponsor data)
- Add backfill_sponsor_ids task + admin endpoint + UI button to fix the
  1,616 existing bills with NULL sponsor_id
- Member name search now matches both "Last, First" and "First Last"
  using split_part() on the stored name column; same fix applied to
  global search
- Load Bill.sponsor relationship eagerly in get_member_bills to prevent
  MissingGreenlet error during Pydantic serialization
- Remove .trim() on search onChange so spaces can be typed

Authored-By: Jack Levy

backend/app/api/members.py

@@ -1,7 +1,7 @@
 from typing import Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
-from sqlalchemy import desc, func, select
+from sqlalchemy import desc, func, or_, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
@@ -30,7 +30,15 @@ async def list_members(
     if state:
         query = query.where(Member.state == state)
     if q:
-        query = query.where(Member.name.ilike(f"%{q}%"))
+        # name is stored as "Last, First" — also match "First Last" order
+        first_last = func.concat(
+            func.split_part(Member.name, ", ", 2), " ",
+            func.split_part(Member.name, ", ", 1),
+        )
+        query = query.where(or_(
+            Member.name.ilike(f"%{q}%"),
+            first_last.ilike(f"%{q}%"),
+        ))
 
     total = await db.scalar(select(func.count()).select_from(query.subquery())) or 0
     query = query.order_by(Member.last_name, Member.first_name).offset((page - 1) * per_page).limit(per_page)
@@ -62,7 +70,7 @@ async def get_member_bills(
     per_page: int = Query(20, ge=1, le=100),
     db: AsyncSession = Depends(get_db),
 ):
-    query = select(Bill).options(selectinload(Bill.briefs)).where(Bill.sponsor_id == bioguide_id)
+    query = select(Bill).options(selectinload(Bill.briefs), selectinload(Bill.sponsor)).where(Bill.sponsor_id == bioguide_id)
     total = await db.scalar(select(func.count()).select_from(query.subquery())) or 0
     query = query.order_by(desc(Bill.introduced_date)).offset((page - 1) * per_page).limit(per_page)