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_stock.py

@@ -0,0 +1,125 @@
+###############################################################################
+#
+# ChartStock - A class for writing the Excel XLSX Stock charts.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+from . import chart
+
+
+class ChartStock(chart.Chart):
+    """
+    A class for writing the Excel XLSX Stock charts.
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self) -> None:
+        """
+        Constructor.
+
+        """
+        super().__init__()
+
+        self.show_crosses = False
+        self.hi_low_lines = {}
+        self.date_category = True
+
+        # Override and reset the default axis values.
+        self.x_axis["defaults"]["num_format"] = "dd/mm/yyyy"
+        self.x2_axis["defaults"]["num_format"] = "dd/mm/yyyy"
+
+        # Set the available data label positions for this chart type.
+        self.label_position_default = "right"
+        self.label_positions = {
+            "center": "ctr",
+            "right": "r",
+            "left": "l",
+            "above": "t",
+            "below": "b",
+            # For backward compatibility.
+            "top": "t",
+            "bottom": "b",
+        }
+
+        self.set_x_axis({})
+        self.set_x2_axis({})
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _write_chart_type(self, args) -> None:
+        # Override the virtual superclass method with a chart specific method.
+        # Write the c:stockChart element.
+        self._write_stock_chart(args)
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_stock_chart(self, args) -> None:
+        # Write the <c:stockChart> element.
+        # Overridden to add hi_low_lines().
+
+        if args["primary_axes"]:
+            series = self._get_primary_axes_series()
+        else:
+            series = self._get_secondary_axes_series()
+
+        if not series:
+            return
+
+        # Add default formatting to the series data.
+        self._modify_series_formatting()
+
+        self._xml_start_tag("c:stockChart")
+
+        # Write the series elements.
+        for data in series:
+            self._write_ser(data)
+
+        # Write the c:dropLines element.
+        self._write_drop_lines()
+
+        # Write the c:hiLowLines element.
+        if args.get("primary_axes"):
+            self._write_hi_low_lines()
+
+        # Write the c:upDownBars element.
+        self._write_up_down_bars()
+
+        # Write the c:axId elements
+        self._write_axis_ids(args)
+
+        self._xml_end_tag("c:stockChart")
+
+    def _modify_series_formatting(self) -> None:
+        # Add default formatting to the series data.
+
+        index = 0
+
+        for series in self.series:
+            if index % 4 != 3:
+                if not series["line"]["defined"]:
+                    series["line"] = {"width": 2.25, "none": 1, "defined": 1}
+
+                if series["marker"] is None:
+                    if index % 4 == 2:
+                        series["marker"] = {"type": "dot", "size": 3}
+                    else:
+                        series["marker"] = {"type": "none"}
+
+            index += 1