feat: enhance PDF comparison with new change types and zoom functionality

- Added support for 'moved' and 'style-changed' change types in PDF comparison.
- Implemented category filters for changes, allowing users to filter by text, images, headers, annotations, formatting, and background.
- Introduced zoom functionality with buttons for zooming in, out, and resetting to default.
- Updated UI to reflect new change types and categories, including visual indicators for moved and style-changed items.
- Enhanced summary display to include counts for moved and style-changed changes.
- Refactored rendering logic to accommodate zoom levels and improve performance.
- Added tests for new change detection features and category assignments.

public/locales/en/tools.json

@@ -292,7 +292,47 @@
   },
   "comparePdfs": {
     "name": "Compare PDFs",
-    "subtitle": "Compare two PDFs side by side."
+    "subtitle": "Compare two PDFs side by side.",
+    "firstPdf": "First PDF",
+    "secondPdf": "Second PDF",
+    "clickOrDrop": "Click or drop",
+    "page": "Page",
+    "overlay": "Overlay",
+    "sideBySide": "Side-by-Side",
+    "flicker": "Flicker",
+    "syncScroll": "Sync scroll",
+    "export": "Export",
+    "exportAsPdf": "Export as PDF",
+    "splitView": "Split view",
+    "alternating": "Alternating",
+    "leftDocument": "Left Document",
+    "rightDocument": "Right Document",
+    "original": "Original",
+    "modified": "Modified",
+    "searchChanges": "Search changes...",
+    "deleted": "Deleted",
+    "added": "Added",
+    "prevPage": "Previous page",
+    "nextPage": "Next page",
+    "prevChange": "Previous change",
+    "nextChange": "Next change",
+    "uploadTwoPdfs": "Upload two PDFs to see differences.",
+    "noDifferences": "No differences detected on this page.",
+    "noMatchingChanges": "No changes match the current filter.",
+    "pageNotExist": "Page {{page}} does not exist in this PDF.",
+    "noPairedPage": "No paired page for this side.",
+    "buildingModel": "Building page pairing model...",
+    "indexingPdf": "Indexing PDF {{num}} page {{page}} of {{total}}...",
+    "loadingComparison": "Loading comparison {{current}} of {{total}}...",
+    "runningOcr": "Running OCR on page {{page}}...",
+    "preparingExport": "Preparing PDF export...",
+    "renderingPage": "Rendering page {{current}} of {{total}}...",
+    "exportError": "Export Error",
+    "exportFailed": "Could not export comparison PDF.",
+    "loadingFile": "Loading {{name}}...",
+    "invalidFile": "Invalid File",
+    "invalidFileMsg": "Please select a valid PDF file.",
+    "loadError": "Could not load PDF. It may be corrupt or password-protected."
   },
   "posterizePdf": {
     "name": "Posterize PDF",