Add xlsxwriter-based Excel generation scripts with openpyxl implementation

- Created create_excel_xlsxwriter.py and update_excel_xlsxwriter.py
- Uses openpyxl exclusively to preserve Excel formatting and formulas
- Updated server.js to use new xlsxwriter scripts for form submissions
- Maintains all original functionality while ensuring proper Excel file handling

🤖 Generated with [Claude Code](https://claude.ai/code)

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

venv/lib/python3.12/site-packages/xlsxwriter/exceptions.py

@@ -0,0 +1,56 @@
+###############################################################################
+#
+# Exceptions - A class for XlsxWriter exceptions.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+
+class XlsxWriterException(Exception):
+    """Base exception for XlsxWriter."""
+
+
+class XlsxInputError(XlsxWriterException):
+    """Base exception for all input data related errors."""
+
+
+class XlsxFileError(XlsxWriterException):
+    """Base exception for all file related errors."""
+
+
+class EmptyChartSeries(XlsxInputError):
+    """Chart must contain at least one data series."""
+
+
+class DuplicateTableName(XlsxInputError):
+    """Worksheet table name already exists."""
+
+
+class InvalidWorksheetName(XlsxInputError):
+    """Worksheet name is too long or contains restricted characters."""
+
+
+class DuplicateWorksheetName(XlsxInputError):
+    """Worksheet name already exists."""
+
+
+class OverlappingRange(XlsxInputError):
+    """Worksheet merge range or table overlaps previous range."""
+
+
+class UndefinedImageSize(XlsxFileError):
+    """No size data found in image file."""
+
+
+class UnsupportedImageFormat(XlsxFileError):
+    """Unsupported image file format."""
+
+
+class FileCreateError(XlsxFileError):
+    """IO error when creating xlsx file."""
+
+
+class FileSizeError(XlsxFileError):
+    """Filesize would require ZIP64 extensions. Use workbook.use_zip64()."""