feat: Invoice Editor improvements and code cleanup

Major Invoice Editor updates:
- ✅ Fixed tripled scrollbar issue by removing unnecessary overflow classes
- ✅ Implemented dynamic currency system with JSON data loading
- ✅ Fixed F4 PDF generation error with proper paper size handling
- ✅ Added proper padding to Total section matching table headers
- ✅ Removed print functionality (users can print from PDF download)
- ✅ Streamlined preview toolbar: Back, Size selector, Download PDF
- ✅ Fixed all ESLint warnings and errors
- ✅ Removed console.log statements across codebase for cleaner production
- ✅ Added border-top to Total section for better visual consistency
- ✅ Improved print CSS and removed JSX warnings

Additional improvements:
- Added currencies.json to public folder for proper HTTP access
- Enhanced MinimalTemplate with better spacing and layout
- Clean build with no warnings or errors
- Updated release notes with new features

src/components/NavigationConfirmModal.js

@@ -0,0 +1,115 @@
+import React from 'react';
+import { AlertTriangle } from 'lucide-react';
+
+const NavigationConfirmModal = ({ isOpen, onConfirm, onCancel, targetPath, hasData }) => {
+  if (!isOpen) return null;
+
+  const getDataSummary = () => {
+    try {
+      const invoiceData = localStorage.getItem('currentInvoice');
+      const objectData = localStorage.getItem('objectEditorData');
+      const tableData = localStorage.getItem('tableEditorData');
+      
+      const summary = [];
+      
+      if (invoiceData) {
+        const parsed = JSON.parse(invoiceData);
+        if (parsed.invoiceNumber) summary.push(`Invoice #${parsed.invoiceNumber}`);
+        if (parsed.company?.name) summary.push(`Company information (${parsed.company.name})`);
+        if (parsed.client?.name) summary.push(`Client information (${parsed.client.name})`);
+        if (parsed.items?.length > 0) summary.push(`${parsed.items.length} line items`);
+      }
+      
+      if (objectData) {
+        const parsed = JSON.parse(objectData);
+        if (parsed && Object.keys(parsed).length > 0) {
+          summary.push(`Object data with ${Object.keys(parsed).length} properties`);
+        }
+      }
+      
+      if (tableData) {
+        const parsed = JSON.parse(tableData);
+        if (parsed && parsed.length > 0) {
+          summary.push(`Table data with ${parsed.length} rows`);
+        }
+      }
+      
+      return summary;
+    } catch (error) {
+      return ['Unsaved data'];
+    }
+  };
+
+  const dataSummary = getDataSummary();
+
+  return (
+    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4">
+      <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl max-w-md w-full overflow-hidden">
+        {/* Header */}
+        <div className="px-6 py-4 border-b border-gray-200 dark:border-gray-700 bg-amber-50 dark:bg-amber-900/20">
+          <div className="flex items-center gap-3">
+            <div className="flex-shrink-0">
+              <AlertTriangle className="h-6 w-6 text-amber-600 dark:text-amber-400" />
+            </div>
+            <div>
+              <h3 className="text-lg font-semibold text-amber-900 dark:text-amber-100">
+                Confirm Navigation
+              </h3>
+              <p className="text-sm text-amber-700 dark:text-amber-300">
+                You have unsaved data that will be lost
+              </p>
+            </div>
+          </div>
+        </div>
+
+        {/* Content */}
+        <div className="px-6 py-4">
+          <p className="text-gray-700 dark:text-gray-300 mb-4">
+            You currently have unsaved data that will be lost if you leave this page. Are you sure you want to continue?
+          </p>
+          
+          {dataSummary.length > 0 && (
+            <div className="bg-gray-50 dark:bg-gray-700 rounded-md p-3 mb-4">
+              <p className="text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">
+                You currently have:
+              </p>
+              <ul className="text-sm text-gray-600 dark:text-gray-400 space-y-1">
+                {dataSummary.map((item, index) => (
+                  <li key={index} className="flex items-center">
+                    <span className="w-1.5 h-1.5 bg-amber-500 rounded-full mr-2 flex-shrink-0"></span>
+                    {item}
+                  </li>
+                ))}
+              </ul>
+            </div>
+          )}
+
+          <div className="bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-md p-3">
+            <p className="text-blue-800 dark:text-blue-200 text-sm">
+              <strong>Tip:</strong> Consider saving or exporting your current work before proceeding.
+            </p>
+          </div>
+        </div>
+
+        {/* Footer */}
+        <div className="px-6 py-4 bg-gray-50 dark:bg-gray-700 border-t border-gray-200 dark:border-gray-600 flex justify-end gap-3">
+          <button
+            onClick={onCancel}
+            className="px-4 py-2 text-sm font-medium text-gray-700 dark:text-gray-300 bg-white dark:bg-gray-600 border border-gray-300 dark:border-gray-500 rounded-md hover:bg-gray-50 dark:hover:bg-gray-500 transition-colors"
+          >
+            Cancel
+          </button>
+          <button
+            onClick={onConfirm}
+            className="px-4 py-2 text-sm font-medium text-white bg-amber-600 hover:bg-amber-700 rounded-md transition-colors flex items-center gap-2"
+          >
+            <AlertTriangle className="h-4 w-4" />
+            Continue & Lose Data
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default NavigationConfirmModal;