Change stub structure

backend/runner/app.py

@@ -381,10 +381,16 @@ def get_models():
 @app.route("/cell-sim", methods=["GET"])
 def cell_similarity():
     if STUB_MODE:
-        # Return stub results for Phase 1
+        # Return stub results that match the expected frontend structure
         return jsonify({
             "sentences": [
-                {"id": f"W123_s{i:04d}", "text": f"Stub cell sentence {i}.", "score": 0.9 - i*0.01}
+                {
+                    "sentence_id": f"W123_s{i:04d}",
+                    "english_original": f"Stub cell sentence {i} for testing.",
+                    "work": "W123",
+                    "score": 0.9 - i*0.01,
+                    "rank": i
+                }
                 for i in range(1, 6)
             ]
         })