remove RAG mode and mode dropdown

src/app.py

@@ -103,30 +103,11 @@ Answer:"""
 # ======================
 # UI Wrapper
 # ======================
-def update_ui(situation, mode):
-    if mode == "RAG":
-        top_idioms = retrieve_idiom(situation, top_k=2)
-        formatted_idioms = []
-        for idiom_entry in top_idioms:
-            # Split "<Chinese>: <English>" format
-            if ": " in idiom_entry:
-                chinese, english = idiom_entry.split(": ", 1)
-            else:
-                chinese, english = idiom_entry, ""
-            pinyin_text = get_pinyin(chinese)
-            formatted_idioms.append(f"<div class='idiom-entry'><b>{chinese}</b><br>{pinyin_text}<br>{english}</div>")
-
-        # Combine all entries with horizontal separators
-        idiom = "<hr>".join(formatted_idioms)
-        explanation = "Retrieved using embeddings (RAG)."
-    elif mode == "LLM":
-        if USE_MOCK:
-            idiom, explanation = generate_idiom_mock()
-        else:
-            idiom, explanation = generate_idiom(situation)
+def update_ui(situation):
+    if USE_MOCK:
+        idiom, explanation = generate_idiom_mock()
     else:
-        idiom = "Unknown mode"
-        explanation = ""
+        idiom, explanation = generate_idiom(situation)
 
     return (
         f"<div class='idiom-output'>{idiom}</div>",
@@ -148,11 +129,6 @@ def launch_app():
                     lines=2,
                     placeholder="e.g., When facing a big challenge",
                 )
-                mode_dropdown = gr.Dropdown(
-                    ["LLM", "RAG"],
-                    label="Mode",
-                    value="RAG",
-                )
                 generate_btn = gr.Button("✨ Find Idiom")
 
                 # ✅ Example situations
@@ -174,7 +150,7 @@ def launch_app():
         # pylint: disable=no-member
         generate_btn.click(
             fn=update_ui,
-            inputs=[situation, mode_dropdown],
+            inputs=[situation],
             outputs=[idiom_output, explanation_output],
         )