[FIX] Empty coefficients (tab3) highlighted in blue (for secondary resources)

tabs/tab3_coefficients.py

@@ -150,8 +150,16 @@ def render_tab(cost_sliders):
 
     for m in method_order:
         for r in resource_order:
-            df_default.at[m, r] = cost_sliders.get(m, {}).get(r, {}).get("median", 0.0)
-            df_current.at[m, r] = st.session_state.costs.get(m, {}).get(r, 0.0)
+            is_secondary = (m, r) in secondary_resources
+            current_val = st.session_state.costs.get(m, {}).get(r, 0.0)
+            
+            if is_secondary:
+                default_val = cost_sliders.get(m, {}).get(r, {}).get("median", 0.0) if current_val != 0.0 else 0.0
+            else:
+                default_val = cost_sliders.get(m, {}).get(r, {}).get("median", 0.0)
+            
+            df_default.at[m, r] = default_val
+            df_current.at[m, r] = current_val
 
     df_default = df_default.astype(float)
     df_current = df_current.astype(float)