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

package.json

@@ -12,13 +12,19 @@
     "@codemirror/search": "^6.5.11",
     "@codemirror/theme-one-dark": "^6.1.3",
     "@codemirror/view": "^6.38.1",
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
     "@testing-library/jest-dom": "^6.8.0",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
     "@uiw/react-codemirror": "^4.25.1",
     "codemirror": "^6.0.2",
     "diff-match-patch": "^1.0.5",
+    "html2pdf.js": "^0.12.1",
     "js-beautify": "^1.15.4",
+    "jspdf": "^3.0.3",
+    "jspdf-autotable": "^5.0.2",
     "lucide-react": "^0.540.0",
     "papaparse": "^5.5.3",
     "react": "18.3.1",