Change specificity to 3-level dropdown (Broad/Moderate/Narrow)

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

app.py

@@ -860,11 +860,11 @@ with col_input:
             help="How many categories should be identified in your data"
         )
 
-        specificity = st.radio(
+        specificity = st.selectbox(
             "Category Specificity",
-            options=["Broad", "Specific"],
-            horizontal=True,
-            help="Broad categories are general themes; Specific categories are more detailed"
+            options=["Broad", "Moderate", "Narrow"],
+            index=0,
+            help="Broad = general themes, Moderate = balanced detail, Narrow = highly specific categories"
         )
 
         focus = st.text_input(