Refresh example queries across three categories

app.py

@@ -1176,12 +1176,12 @@ EXAMPLES = [
     {
         "category": "Fixed facts",
         "icon": "🎯",
-        "text": "Which university first awarded a PhD in computer science, and in what year?",
+        "text": "Who were the first two people to win a Nobel Prize in two different scientific disciplines, and in which fields?",
     },
     {
         "category": "Time-varying",
         "icon": "📈",
-        "text": "What is the current CEO of OpenAI, and when did they take the role?",
+        "text": "Which open-source LLM currently ranks highest on the LMArena leaderboard, and who released it?",
     },
     {
         "category": "Multi-constraints",
@@ -1191,7 +1191,7 @@ EXAMPLES = [
     {
         "category": "Long-form research report",
         "icon": "📚",
-        "text": "Compare three leading open-source coding agents with their strengths, weaknesses, and recent benchmark results.",
+        "text": "Write a structured overview of open-source approaches to reducing LLM hallucination in 2025–2026, covering the main methods, representative papers, and their trade-offs.",
     },
 ]