feat(favicon,repair-pdf): Add favicon support and implement PDF repair tool

- Add favicon.ico to public directory for browser tab display
- Update favicon references across all HTML pages with proper link tags for SVG, PNG, and ICO formats
- Add Apple touch icon support for iOS devices
- Create new repair-pdf.ts logic module for PDF repair functionality
- Create new repair-pdf-page.ts utility module for page-level repair operations
- Add repair-pdf.html page with UI for PDF repair tool
- Register repair PDF tool in tools configuration and PDF tools registry
- Update UI rendering utilities to support new repair tool
- Improve favicon handling with multiple format fallbacks for cross-browser compatibility
- Standardize favicon paths to use absolute URLs for consistency
- Clean up whitespace and formatting in licensing.html for code consistency

src/js/ui.ts

@@ -44,19 +44,23 @@ export const dom = {
 };
 
 export const showLoader = (text = 'Processing...') => {
-    dom.loaderText.textContent = text;
-    dom.loaderModal.classList.remove('hidden');
+    if (dom.loaderText) dom.loaderText.textContent = text;
+    if (dom.loaderModal) dom.loaderModal.classList.remove('hidden');
 };
 
-export const hideLoader = () => dom.loaderModal.classList.add('hidden');
+export const hideLoader = () => {
+    if (dom.loaderModal) dom.loaderModal.classList.add('hidden');
+};
 
 export const showAlert = (title: any, message: any) => {
-    dom.alertTitle.textContent = title;
-    dom.alertMessage.textContent = message;
-    dom.alertModal.classList.remove('hidden');
+    if (dom.alertTitle) dom.alertTitle.textContent = title;
+    if (dom.alertMessage) dom.alertMessage.textContent = message;
+    if (dom.alertModal) dom.alertModal.classList.remove('hidden');
 };
 
-export const hideAlert = () => dom.alertModal.classList.add('hidden');
+export const hideAlert = () => {
+    if (dom.alertModal) dom.alertModal.classList.add('hidden');
+};
 
 export const switchView = (view: any) => {
     if (view === 'grid') {
@@ -243,7 +247,7 @@ export const renderPageThumbnails = async (toolId: any, pdfDoc: any) => {
             container,
             createWrapper,
             {
-                batchSize: 6,
+                batchSize: 8,
                 useLazyLoading: true,
                 lazyLoadMargin: '300px',
                 onProgress: (current, total) => {