Update business case form with currency symbol and improved functionality

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

update_excel_xlsxwriter.py

@@ -3,7 +3,59 @@ import json
 import os
 import re
 import openpyxl
-from openpyxl.utils import get_column_letter
+
+CURRENCY_LOCALE_MAP = {
+    '$': '-409',  # English (US)
+    '€': '-2',    # English (Euro)
+}
+
+CURRENCY_BRACKET_PATTERN = re.compile(r'\[\$([^\]-]*)(-[^\]]*)?\]')
+
+
+def apply_currency_symbol(workbook, symbol):
+    """Propagate the selected currency symbol across formats, labels, and charts."""
+    target_symbol = (symbol or '$').strip() or '$'
+
+    def replace_currency_token(fmt):
+        if not isinstance(fmt, str) or ('$' not in fmt and '€' not in fmt):
+            return fmt
+
+        def _replace_match(match):
+            locale_hint = match.group(2) or ''
+            if target_symbol in CURRENCY_LOCALE_MAP:
+                locale_hint = f"-{CURRENCY_LOCALE_MAP[target_symbol].lstrip('-')}" if match.group(2) or locale_hint else ''
+            return f'[${target_symbol}{locale_hint}]'
+
+        updated = CURRENCY_BRACKET_PATTERN.sub(_replace_match, fmt)
+        updated = updated.replace('"$"', f'"{target_symbol}"')
+        return updated
+
+    for worksheet in workbook.worksheets:
+        for row in worksheet.iter_rows():
+            for cell in row:
+                fmt = cell.number_format
+                updated_format = replace_currency_token(fmt)
+                if updated_format != fmt:
+                    cell.number_format = updated_format
+
+                value = cell.value
+                if isinstance(value, str) and not value.startswith('=') and ('€' in value or '$' in value):
+                    new_value = value.replace('€', target_symbol).replace('$', target_symbol)
+                    if new_value != value:
+                        cell.value = new_value
+
+        for chart in getattr(worksheet, '_charts', []):
+            axes = [getattr(chart, 'y_axis', None), getattr(chart, 'secondary_y_axis', None)]
+            for axis in axes:
+                if not axis or not getattr(axis, 'number_format', None):
+                    continue
+                fmt_obj = axis.number_format
+                format_code = getattr(fmt_obj, 'formatCode', None)
+                if not isinstance(format_code, str):
+                    continue
+                updated_code = replace_currency_token(format_code)
+                if updated_code != format_code:
+                    fmt_obj.formatCode = updated_code
 
 def update_excel_variables(excel_path):
     """
@@ -153,6 +205,8 @@ def update_excel_variables(excel_path):
             except Exception as e:
                 print(f"Error updating cell {cell_ref}: {e}")
 
+        apply_currency_symbol(wb, user_data.get('currency_symbol', ''))
+
         # Force formula recalculation before saving
         print("Forcing formula recalculation...")
         wb.calculation.calcMode = 'auto'