feat(ocr,form-creator): Add comprehensive font support and TypeScript type definitions

- Add @pdf-lib/fontkit dependency for enhanced font rendering capabilities
- Create font-mappings.ts configuration with language-to-font-family mappings for 100+ languages
- Implement font-loader.ts utility for dynamic font loading from CDN sources
- Add TypeScript type definitions for form-creator, OCR, and general application types
- Create types/index.ts as centralized type exports
- Remove hidden-on-touch CSS class and update shortcuts button styling for better accessibility
- Update OCR text layer rendering to support multilingual font families
- Enhance form-creator with improved font handling for international text
- Update txt-to-pdf with font support for diverse character sets
- Migrate fileHandler to support new font loading workflow
- Update main.ts and ui.ts to integrate new type system and font utilities
- Update form-creator.html page with enhanced font configuration UI

src/css/styles.css

@@ -568,20 +568,6 @@ button:disabled,
   background: #6b7280;
 }
 
-/* Hide elements on touch devices */
-@media (pointer: coarse) {
-  .hidden-on-touch {
-    display: none !important;
-  }
-}
-
-/* Also hide on very small screens just in case */
-@media (max-width: 640px) {
-  .hidden-on-touch {
-    display: none !important;
-  }
-}
-
 /* Scroll to Top Button Visibility */
 #scroll-to-top-btn.visible {
   opacity: 1;