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_column.py

@@ -0,0 +1,135 @@
+###############################################################################
+#
+# ChartColumn - A class for writing the Excel XLSX Column 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 ChartColumn(chart.Chart):
+    """
+    A class for writing the Excel XLSX Column 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 = "clustered"
+
+        self.horiz_val_axis = 0
+
+        if self.subtype == "percent_stacked":
+            self.y_axis["defaults"]["num_format"] = "0%"
+
+        # Set the available data label positions for this chart type.
+        self.label_position_default = "outside_end"
+        self.label_positions = {
+            "center": "ctr",
+            "inside_base": "inBase",
+            "inside_end": "inEnd",
+            "outside_end": "outEnd",
+        }
+
+        self.set_y_axis({})
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _write_chart_type(self, args) -> None:
+        # Override the virtual superclass method with a chart specific method.
+
+        # Write the c:barChart element.
+        self._write_bar_chart(args)
+
+    def _write_bar_chart(self, args) -> None:
+        # Write the <c:barChart> element.
+
+        if args["primary_axes"]:
+            series = self._get_primary_axes_series()
+        else:
+            series = self._get_secondary_axes_series()
+
+        if not series:
+            return
+
+        subtype = self.subtype
+        if subtype == "percent_stacked":
+            subtype = "percentStacked"
+
+        # Set a default overlap for stacked charts.
+        if "stacked" in self.subtype and self.series_overlap_1 is None:
+            self.series_overlap_1 = 100
+
+        self._xml_start_tag("c:barChart")
+
+        # Write the c:barDir element.
+        self._write_bar_dir()
+
+        # Write the c:grouping element.
+        self._write_grouping(subtype)
+
+        # Write the c:ser elements.
+        for data in series:
+            self._write_ser(data)
+
+        # Write the c:gapWidth element.
+        if args["primary_axes"]:
+            self._write_gap_width(self.series_gap_1)
+        else:
+            self._write_gap_width(self.series_gap_2)
+
+        # Write the c:overlap element.
+        if args["primary_axes"]:
+            self._write_overlap(self.series_overlap_1)
+        else:
+            self._write_overlap(self.series_overlap_2)
+
+        # Write the c:axId elements
+        self._write_axis_ids(args)
+
+        self._xml_end_tag("c:barChart")
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_bar_dir(self) -> None:
+        # Write the <c:barDir> element.
+        val = "col"
+
+        attributes = [("val", val)]
+
+        self._xml_empty_tag("c:barDir", attributes)
+
+    def _write_err_dir(self, val) -> None:
+        # Overridden from Chart class since it is not used in Column charts.
+        pass