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/chart_radar.py

@@ -0,0 +1,105 @@
+###############################################################################
+#
+# ChartRadar - A class for writing the Excel XLSX Radar charts.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+from typing import Any, Dict, Optional
+
+from . import chart
+
+
+class ChartRadar(chart.Chart):
+    """
+    A class for writing the Excel XLSX Radar charts.
+
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self, options: Optional[Dict[str, Any]] = None) -> None:
+        """
+        Constructor.
+
+        """
+        super().__init__()
+
+        if options is None:
+            options = {}
+
+        self.subtype = options.get("subtype")
+
+        if not self.subtype:
+            self.subtype = "marker"
+            self.default_marker = {"type": "none"}
+
+        # Override and reset the default axis values.
+        self.x_axis["defaults"]["major_gridlines"] = {"visible": 1}
+        self.set_x_axis({})
+
+        # Set the available data label positions for this chart type.
+        self.label_position_default = "center"
+        self.label_positions = {"center": "ctr"}
+
+        # Hardcode major_tick_mark for now until there is an accessor.
+        self.y_axis["major_tick_mark"] = "cross"
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _write_chart_type(self, args) -> None:
+        # Write the c:radarChart element.
+        self._write_radar_chart(args)
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_radar_chart(self, args) -> None:
+        # Write the <c:radarChart> element.
+
+        if args["primary_axes"]:
+            series = self._get_primary_axes_series()
+        else:
+            series = self._get_secondary_axes_series()
+
+        if not series:
+            return
+
+        self._xml_start_tag("c:radarChart")
+
+        # Write the c:radarStyle element.
+        self._write_radar_style()
+
+        # Write the series elements.
+        for data in series:
+            self._write_ser(data)
+
+        # Write the c:axId elements
+        self._write_axis_ids(args)
+
+        self._xml_end_tag("c:radarChart")
+
+    def _write_radar_style(self) -> None:
+        # Write the <c:radarStyle> element.
+        val = "marker"
+
+        if self.subtype == "filled":
+            val = "filled"
+
+        attributes = [("val", val)]
+
+        self._xml_empty_tag("c:radarStyle", attributes)