feat(pdf-tools): add linearize pdf tool for web optimization

Add new linearize PDF tool that optimizes PDFs for fast web viewing using qpdf-wasm. Includes UI components, logic implementation, and test updates. The tool processes multiple PDFs and downloads them in a ZIP archive.

src/js/config/pdf-tools.ts

@@ -60,4 +60,5 @@ export const multiFileTools = [
   'heic-to-pdf',
   'tiff-to-pdf',
   'alternate-merge',
+  'linearize',
 ];

src/js/config/tools.ts

@@ -383,6 +383,12 @@ export const categories = [
         icon: 'ruler-dimension-line',
         subtitle: 'Standardize all pages to a uniform size.',
       },
+      { 
+        id: 'linearize',
+        name: 'Linearize PDF',
+        icon: 'zap',
+        subtitle: 'Optimize PDF for fast web viewing.',
+      },
       {
         id: 'page-dimensions',
         name: 'Page Dimensions',