Refactor sheet operations and update documentation

- Improve `copy_range_operation` with more robust error handling and style copying
- Enhance `delete_range_operation` with shift direction support
- Update README with Cursor IDE connection instructions
- Remove unnecessary parameters from `create_pivot_table`
- Improve logging and error validation in sheet operations

src/excel_mcp/server.py

@@ -285,7 +285,6 @@ def create_pivot_table(
     filepath: str,
     sheet_name: str,
     data_range: str,
-    target_cell: str,
     rows: List[str],
     values: List[str],
     columns: List[str] = None,
@@ -298,7 +297,6 @@ def create_pivot_table(
             filepath=full_path,
             sheet_name=sheet_name,
             data_range=data_range,
-            target_cell=target_cell,
             rows=rows,
             values=values,
             columns=columns or [],