Configure template target cells and add skip-errors mode

src/taetigkeitsnachweis/writer.py

@@ -67,7 +67,11 @@ def build_employee_workbooks(
 
     for employee_name, assignments in assignments_by_employee.items():
         workbook = load_workbook(template_path)
-        base_sheet = workbook.worksheets[0]
+        template_sheet_name = config["sheets"].get("template_source", "")
+        if template_sheet_name and template_sheet_name in workbook.sheetnames:
+            base_sheet = workbook[template_sheet_name]
+        else:
+            base_sheet = workbook.worksheets[0]
 
         for index, assignment in enumerate(assignments, start=1):
             if index == 1: