fix(news): robust gnews URL extraction + smarter lazy trigger

- Replace fragile entry.get("link") with _gnews_entry_url() helper that
  checks entry.link attribute then falls back to entry.links[].href,
  fixing cases where feedparser puts the URL in a non-standard location
- Lazy news re-fetch on bill detail now only triggers when the stored
  trend score confirms gnews_count > 0, preventing endless re-queuing
  for bills with genuinely no news coverage

Co-Authored-By: Jack Levy

backend/app/api/bills.py

@@ -110,8 +110,11 @@ async def get_bill(bill_id: str, db: AsyncSession = Depends(get_db)):
     if bill.trend_scores:
         detail.latest_trend = bill.trend_scores[0]
 
-    # Trigger a background news refresh if no articles are stored yet
-    if not bill.news_articles:
+    # Trigger a background news refresh if no articles are stored but trend
+    # data shows there are gnews results out there waiting to be fetched.
+    latest_trend = bill.trend_scores[0] if bill.trend_scores else None
+    has_gnews = latest_trend and (latest_trend.gnews_count or 0) > 0
+    if not bill.news_articles and has_gnews:
         try:
             from app.workers.news_fetcher import fetch_news_for_bill
             fetch_news_for_bill.delay(bill_id)