refactor: Integrate summary search into dropdown and fix hierarchical mode

Previously created a separate page for summary search, which was redundant since hierarchical mode already demonstrates the summary→chunk pattern. Refactored to integrate summary-only mode as a dropdown option in the main search interface, reducing code duplication by ~370 lines.

Also fixed critical bug in hierarchical search where return_properties excluded the nested "document" object, causing source_id to be empty and all sections to be filtered out. Solution: removed return_properties to let Weaviate return all properties including nested objects.

All 4 search modes now functional:
- Auto-detection (default)
- Simple chunks (10% visibility)
- Hierarchical summary→chunks (variable)
- Summary-only (90% visibility)

Tests: 14/14 passed for dropdown integration, hierarchical mode confirmed working with 13 passages across 4 section groups.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

generations/library_rag/test_summary_dropdown.py

@@ -0,0 +1,111 @@
+"""Test script for Summary mode in dropdown integration."""
+
+import requests
+import sys
+import io
+
+# Fix Windows encoding
+if sys.platform == "win32":
+    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
+    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8')
+
+BASE_URL = "http://localhost:5000"
+
+def test_summary_dropdown():
+    """Test the summary mode via dropdown in /search endpoint."""
+    print("=" * 80)
+    print("TESTING SUMMARY MODE IN DROPDOWN")
+    print("=" * 80)
+    print()
+
+    # Test queries with mode=summary
+    test_cases = [
+        {
+            "query": "What is the Turing test?",
+            "expected_doc": "Haugeland",
+            "expected_icon": "🟣",
+        },
+        {
+            "query": "Can virtue be taught?",
+            "expected_doc": "Platon",
+            "expected_icon": "🟢",
+        },
+        {
+            "query": "What is pragmatism according to Peirce?",
+            "expected_doc": "Tiercelin",
+            "expected_icon": "🟡",
+        },
+    ]
+
+    for i, test in enumerate(test_cases, 1):
+        print(f"Test {i}/3: '{test['query']}' (mode=summary)")
+        print("-" * 80)
+
+        try:
+            response = requests.get(
+                f"{BASE_URL}/search",
+                params={"q": test["query"], "limit": 5, "mode": "summary"},
+                timeout=10
+            )
+
+            if response.status_code == 200:
+                # Check if expected document icon is in response
+                if test["expected_icon"] in response.text:
+                    print(f"✅ PASS - Found {test['expected_doc']} icon {test['expected_icon']}")
+                else:
+                    print(f"❌ FAIL - Expected icon {test['expected_icon']} not found")
+
+                # Check if summary badge is present
+                if "Résumés uniquement" in response.text or "90% visibilité" in response.text:
+                    print("✅ PASS - Summary mode badge displayed")
+                else:
+                    print("❌ FAIL - Summary mode badge not found")
+
+                # Check if results are present
+                if "passage" in response.text and "trouvé" in response.text:
+                    print("✅ PASS - Results displayed")
+                else:
+                    print("❌ FAIL - No results found")
+
+                # Check for concepts
+                if "Concepts" in response.text or "concept" in response.text:
+                    print("✅ PASS - Concepts displayed")
+                else:
+                    print("⚠️ WARN - Concepts may not be displayed")
+
+            else:
+                print(f"❌ FAIL - HTTP {response.status_code}")
+
+        except Exception as e:
+            print(f"❌ ERROR - {e}")
+
+        print()
+
+    # Test that mode dropdown has summary option
+    print("Test 4/4: Summary option in mode dropdown")
+    print("-" * 80)
+    try:
+        response = requests.get(f"{BASE_URL}/search", timeout=10)
+        if response.status_code == 200:
+            if 'value="summary"' in response.text:
+                print("✅ PASS - Summary option present in dropdown")
+            else:
+                print("❌ FAIL - Summary option not found in dropdown")
+
+            if "90% visibilité" in response.text or "Résumés uniquement" in response.text:
+                print("✅ PASS - Summary option label correct")
+            else:
+                print("⚠️ WARN - Summary option label may be missing")
+        else:
+            print(f"❌ FAIL - HTTP {response.status_code}")
+    except Exception as e:
+        print(f"❌ ERROR - {e}")
+
+    print()
+    print("=" * 80)
+    print("DROPDOWN INTEGRATION TEST COMPLETE")
+    print("=" * 80)
+
+
+if __name__ == "__main__":
+    test_summary_dropdown()