fix: input validierung überspringt erstes sheet, weil diese nur zur Übersicht ist

app.py

@@ -75,15 +75,30 @@ with col1:
         input_path = Path(app_config.input_dir) / selected_input
         # Validiere und parse sofort
         with st.spinner("Validiere Input-Datei…"):
-            val_result = validate_input_file(input_path, app_config.input_schema)
+            val_result = validate_input_file(input_path, app_config.input_schema, app_config.month_sheet_pattern)
 
         if not val_result.is_valid:
+            st.markdown(
+                '<div style="border:2px solid #e74c3c; border-radius:8px; padding:12px; '
+                'background:#fdedec; margin-bottom:12px">'
+                '<span style="color:#b03a2e; font-weight:bold; font-size:1.1em">'
+                '❌ Validierung fehlgeschlagen</span></div>',
+                unsafe_allow_html=True,
+            )
             for err in val_result.errors:
-                st.error(err)
+                st.error(f"🔴 {err}")
             st.session_state.input_validated = False
         else:
-            for warn in val_result.warnings:
-                st.warning(warn)
+            if val_result.warnings:
+                st.markdown(
+                    '<div style="border:2px solid #f39c12; border-radius:8px; padding:8px 12px; '
+                    'background:#fef9e7; margin-bottom:8px">'
+                    '<span style="color:#7d6608; font-weight:bold">'
+                    '⚠️ Hinweise</span></div>',
+                    unsafe_allow_html=True,
+                )
+                for warn in val_result.warnings:
+                    st.warning(warn)
 
             # Parse die Datei
             records = parse_input_file(
@@ -130,8 +145,15 @@ with col2:
             tpl_result = validate_template(template_path, app_config.output_mapping)
 
         if not tpl_result.is_valid:
+            st.markdown(
+                '<div style="border:2px solid #e74c3c; border-radius:8px; padding:12px; '
+                'background:#fdedec; margin-bottom:12px">'
+                '<span style="color:#b03a2e; font-weight:bold; font-size:1.1em">'
+                '❌ Validierung fehlgeschlagen</span></div>',
+                unsafe_allow_html=True,
+            )
             for err in tpl_result.errors:
-                st.error(err)
+                st.error(f"🔴 {err}")
             st.session_state.template_validated = False
         else:
             st.session_state.template_validated = True
@@ -139,6 +161,13 @@ with col2:
             total = tpl_result.info.get("total_target_cells", 0)
             st.success(f"✅ {found}/{total} Zielfelder gefunden")
             if tpl_result.warnings:
+                st.markdown(
+                    '<div style="border:2px solid #f39c12; border-radius:8px; padding:8px 12px; '
+                    'background:#fef9e7; margin-bottom:8px">'
+                    '<span style="color:#7d6608; font-weight:bold">'
+                    '⚠️ Hinweise</span></div>',
+                    unsafe_allow_html=True,
+                )
                 for warn in tpl_result.warnings:
                     st.warning(warn)