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/js/types/form-creator.ts

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+export interface FormField {
+    id: string
+    type: 'text' | 'checkbox' | 'radio' | 'dropdown' | 'optionlist' | 'button' | 'signature' | 'date' | 'image'
+    x: number
+    y: number
+    width: number
+    height: number
+    name: string
+    defaultValue: string
+    fontSize: number
+    alignment: 'left' | 'center' | 'right'
+    textColor: string
+    required: boolean
+    readOnly: boolean
+    tooltip: string
+    combCells: number
+    maxLength: number
+    options?: string[]
+    checked?: boolean
+    exportValue?: string
+    groupName?: string
+    label?: string
+    pageIndex: number
+    action?: 'none' | 'reset' | 'print' | 'url' | 'js' | 'showHide'
+    actionUrl?: string
+    jsScript?: string
+    targetFieldName?: string
+    visibilityAction?: 'show' | 'hide' | 'toggle'
+    dateFormat?: string
+    multiline?: boolean
+    borderColor?: string
+    hideBorder?: boolean
+}
+
+export interface PageData {
+    index: number
+    width: number
+    height: number
+    pdfPageData?: string
+}

src/js/types/index.ts

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+export * from './ocr.js';
+export * from './form-creator.js';

src/js/types/ocr.ts

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+export interface Word {
+    text: string;
+    bbox: {
+        x0: number;
+        y0: number;
+        x1: number;
+        y1: number;
+    };
+    confidence: number;
+}