feat(interest): add public interest tracking for members of Congress

Adds Google Trends, NewsAPI, and Google News RSS scoring for members,
mirroring the existing bill interest pipeline. Member profiles now show
a Public Interest chart (with signal breakdown) and a Related News panel.

Key changes:
- New member_trend_scores + member_news_articles tables (migration 0008)
- fetch_gnews_articles() added to news_service for unlimited RSS article storage
- Bill news fetcher now combines NewsAPI + Google News RSS (more coverage)
- New member_interest Celery worker with scheduled news + trend tasks
- GET /members/{id}/trend and /news API endpoints
- TrendChart redesigned with signal breakdown badges and bar+line combo chart
- NewsPanel accepts generic article shape (bills and members)

Co-Authored-By: Jack Levy

frontend/lib/hooks/useMembers.ts

@@ -26,3 +26,21 @@ export function useMemberBills(id: string) {
     enabled: !!id,
   });
 }
+
+export function useMemberTrend(id: string, days = 30) {
+  return useQuery({
+    queryKey: ["member-trend", id, days],
+    queryFn: () => membersAPI.getTrend(id, days),
+    staleTime: 60 * 60 * 1000,
+    enabled: !!id,
+  });
+}
+
+export function useMemberNews(id: string) {
+  return useQuery({
+    queryKey: ["member-news", id],
+    queryFn: () => membersAPI.getNews(id),
+    staleTime: 10 * 60 * 1000,
+    enabled: !!id,
+  });
+}