fix: show ZOPK facts from different source articles

Pick one fact from each of the 3 most recent distinct articles
instead of 3 facts from the same article.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

blueprints/public/routes.py

@@ -128,15 +128,26 @@ def index():
         # Backward compat — next_event used by other parts
         next_event = upcoming_events[0]['event'] if upcoming_events else None
 
-        # ZOPK Knowledge facts — widget dla zalogowanych (najnowsze i najistotniejsze)
+        # ZOPK Knowledge facts — widget dla zalogowanych (najnowsze z różnych źródeł)
         zopk_facts = []
         if current_user.is_authenticated:
             try:
                 from database import ZOPKKnowledgeFact, ZOPKNews
-                zopk_facts = db.query(ZOPKKnowledgeFact).join(ZOPKNews).filter(
+                from sqlalchemy import distinct
+                # Pobierz najnowszy fakt z każdego z 3 różnych artykułów
+                recent_news_ids = db.query(distinct(ZOPKKnowledgeFact.source_news_id)).join(ZOPKNews).filter(
                     ZOPKKnowledgeFact.confidence_score >= 0.5,
                     ZOPKNews.published_at.isnot(None)
                 ).order_by(ZOPKNews.published_at.desc()).limit(3).all()
+                news_ids = [r[0] for r in recent_news_ids]
+                if news_ids:
+                    # Po jednym fakcie z każdego artykułu
+                    for nid in news_ids:
+                        fact = db.query(ZOPKKnowledgeFact).filter(
+                            ZOPKKnowledgeFact.source_news_id == nid
+                        ).order_by(ZOPKKnowledgeFact.confidence_score.desc()).first()
+                        if fact:
+                            zopk_facts.append(fact)
             except Exception:
                 pass