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/chartsheet.py

@@ -0,0 +1,203 @@
+###############################################################################
+#
+# Chartsheet - A class for writing the Excel XLSX Worksheet file.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+from typing import Any, Dict, Optional
+
+from xlsxwriter.chart import Chart
+
+from . import worksheet
+from .drawing import Drawing
+
+
+class Chartsheet(worksheet.Worksheet):
+    """
+    A class for writing the Excel XLSX Chartsheet file.
+
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self) -> None:
+        """
+        Constructor.
+
+        """
+
+        super().__init__()
+
+        self.is_chartsheet = True
+        self.drawing = None
+        self.chart = None
+        self.charts = []
+        self.zoom_scale_normal = 0
+        self.orientation = 0
+        self.protection = False
+
+    def set_chart(self, chart: Chart) -> Chart:
+        """
+        Set the chart object for the chartsheet.
+        Args:
+            chart:  Chart object.
+        Returns:
+            chart:  A reference to the chart object.
+        """
+        chart.embedded = False
+        chart.protection = self.protection
+        self.chart = chart
+        self.charts.append([0, 0, chart, 0, 0, 1, 1])
+        return chart
+
+    def protect(
+        self, password: str = "", options: Optional[Dict[str, Any]] = None
+    ) -> None:
+        """
+        Set the password and protection options of the worksheet.
+
+        Args:
+            password: An optional password string.
+            options:  A dictionary of worksheet objects to protect.
+
+        Returns:
+            Nothing.
+
+        """
+        # This method is overridden from parent worksheet class.
+
+        # Chartsheets only allow a reduced set of protect options.
+        copy = {}
+
+        if not options:
+            options = {}
+
+        if options.get("objects") is None:
+            copy["objects"] = False
+        else:
+            # Objects are default on for chartsheets, so reverse state.
+            copy["objects"] = not options["objects"]
+
+        if options.get("content") is None:
+            copy["content"] = True
+        else:
+            copy["content"] = options["content"]
+
+        copy["sheet"] = False
+        copy["scenarios"] = True
+
+        # If objects and content are both off then the chartsheet isn't
+        # protected, unless it has a password.
+        if password == "" and copy["objects"] and not copy["content"]:
+            return
+
+        if self.chart:
+            self.chart.protection = True
+        else:
+            self.protection = True
+
+        # Call the parent method.
+        super().protect(password, copy)
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+    def _assemble_xml_file(self) -> None:
+        # Assemble and write the XML file.
+
+        # Write the XML declaration.
+        self._xml_declaration()
+
+        # Write the root worksheet element.
+        self._write_chartsheet()
+
+        # Write the worksheet properties.
+        self._write_sheet_pr()
+
+        # Write the sheet view properties.
+        self._write_sheet_views()
+
+        # Write the sheetProtection element.
+        self._write_sheet_protection()
+
+        # Write the printOptions element.
+        self._write_print_options()
+
+        # Write the worksheet page_margins.
+        self._write_page_margins()
+
+        # Write the worksheet page setup.
+        self._write_page_setup()
+
+        # Write the headerFooter element.
+        self._write_header_footer()
+
+        # Write the drawing element.
+        self._write_drawings()
+
+        # Write the legacyDrawingHF element.
+        self._write_legacy_drawing_hf()
+
+        # Close the worksheet tag.
+        self._xml_end_tag("chartsheet")
+
+        # Close the file.
+        self._xml_close()
+
+    def _prepare_chart(self, index, chart_id, drawing_id) -> None:
+        # Set up chart/drawings.
+
+        self.chart.id = chart_id - 1
+
+        self.drawing = Drawing()
+        self.drawing.orientation = self.orientation
+
+        self.external_drawing_links.append(
+            ["/drawing", "../drawings/drawing" + str(drawing_id) + ".xml"]
+        )
+
+        self.drawing_links.append(
+            ["/chart", "../charts/chart" + str(chart_id) + ".xml"]
+        )
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_chartsheet(self) -> None:
+        # Write the <worksheet> element. This is the root element.
+
+        schema = "http://schemas.openxmlformats.org/"
+        xmlns = schema + "spreadsheetml/2006/main"
+        xmlns_r = schema + "officeDocument/2006/relationships"
+
+        attributes = [("xmlns", xmlns), ("xmlns:r", xmlns_r)]
+
+        self._xml_start_tag("chartsheet", attributes)
+
+    def _write_sheet_pr(self) -> None:
+        # Write the <sheetPr> element for Sheet level properties.
+        attributes = []
+
+        if self.filter_on:
+            attributes.append(("filterMode", 1))
+
+        if self.fit_page or self.tab_color:
+            self._xml_start_tag("sheetPr", attributes)
+            self._write_tab_color()
+            self._write_page_set_up_pr()
+            self._xml_end_tag("sheetPr")
+        else:
+            self._xml_empty_tag("sheetPr", attributes)