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/custom.py

@@ -0,0 +1,138 @@
+###############################################################################
+#
+# Custom - A class for writing the Excel XLSX Custom Property file.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+# Package imports.
+from typing import List, Tuple
+
+from . import xmlwriter
+
+
+class Custom(xmlwriter.XMLwriter):
+    """
+    A class for writing the Excel XLSX Custom Workbook Property file.
+
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self) -> None:
+        """
+        Constructor.
+
+        """
+
+        super().__init__()
+
+        self.properties = []
+        self.pid = 1
+
+    def _set_properties(self, properties: List[Tuple[str, str, str]]) -> None:
+        # Set the document properties.
+        self.properties = properties
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _assemble_xml_file(self) -> None:
+        # Assemble and write the XML file.
+
+        # Write the XML declaration.
+        self._xml_declaration()
+
+        self._write_properties()
+
+        self._xml_end_tag("Properties")
+
+        # Close the file.
+        self._xml_close()
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_properties(self) -> None:
+        # Write the <Properties> element.
+        schema = "http://schemas.openxmlformats.org/officeDocument/2006/"
+        xmlns = schema + "custom-properties"
+        xmlns_vt = schema + "docPropsVTypes"
+
+        attributes = [
+            ("xmlns", xmlns),
+            ("xmlns:vt", xmlns_vt),
+        ]
+
+        self._xml_start_tag("Properties", attributes)
+
+        for custom_property in self.properties:
+            # Write the property element.
+            self._write_property(custom_property)
+
+    def _write_property(self, custom_property: Tuple[str, str, str]) -> None:
+        # Write the <property> element.
+
+        fmtid = "{D5CDD505-2E9C-101B-9397-08002B2CF9AE}"
+
+        name, value, property_type = custom_property
+        self.pid += 1
+
+        attributes = [
+            ("fmtid", fmtid),
+            ("pid", self.pid),
+            ("name", name),
+        ]
+
+        self._xml_start_tag("property", attributes)
+
+        if property_type == "number_int":
+            # Write the vt:i4 element.
+            self._write_vt_i4(value)
+        elif property_type == "number":
+            # Write the vt:r8 element.
+            self._write_vt_r8(value)
+        elif property_type == "date":
+            # Write the vt:filetime element.
+            self._write_vt_filetime(value)
+        elif property_type == "bool":
+            # Write the vt:bool element.
+            self._write_vt_bool(value)
+        else:
+            # Write the vt:lpwstr element.
+            self._write_vt_lpwstr(value)
+
+        self._xml_end_tag("property")
+
+    def _write_vt_lpwstr(self, value: str) -> None:
+        # Write the <vt:lpwstr> element.
+        self._xml_data_element("vt:lpwstr", value)
+
+    def _write_vt_filetime(self, value: str) -> None:
+        # Write the <vt:filetime> element.
+        self._xml_data_element("vt:filetime", value)
+
+    def _write_vt_i4(self, value: str) -> None:
+        # Write the <vt:i4> element.
+        self._xml_data_element("vt:i4", value)
+
+    def _write_vt_r8(self, value: str) -> None:
+        # Write the <vt:r8> element.
+        self._xml_data_element("vt:r8", value)
+
+    def _write_vt_bool(self, value: str) -> None:
+        # Write the <vt:bool> element.
+        self._xml_data_element("vt:bool", value)