feat(pdf-tools): add sanitize-pdf tool for comprehensive document cleaning

Implement a new PDF sanitization tool that allows users to remove various potentially sensitive elements from PDFs including metadata, annotations, JavaScript, embedded files, and more. The tool provides configurable options through checkboxes to selectively remove different types of content while preserving the core document structure.

Extract reusable utility functions from existing tools (remove-metadata, remove-annotations, flatten) to support the new sanitization feature. The tool handles edge cases gracefully and provides feedback when no changes are made.

src/js/logic/remove-annotations.ts

@@ -28,6 +28,48 @@ export function setupRemoveAnnotationsTool() {
   });
 }
 
+export function removeAnnotationsFromDoc(
+  pdfDoc,
+  pageIndices = null,
+  annotationTypes = null
+) {
+  const pages = pdfDoc.getPages();
+  const targetPages =
+    pageIndices || Array.from({ length: pages.length }, (_, i) => i);
+
+  for (const pageIndex of targetPages) {
+    const page = pages[pageIndex];
+    const annotRefs = page.node.Annots()?.asArray() || [];
+
+    if (!annotationTypes) {
+      if (annotRefs.length > 0) {
+        page.node.delete(PDFName.of('Annots'));
+      }
+    } else {
+      const annotsToKeep = [];
+
+      for (const ref of annotRefs) {
+        const annot = pdfDoc.context.lookup(ref);
+        const subtype = annot
+          .get(PDFName.of('Subtype'))
+          ?.toString()
+          .substring(1);
+
+        if (!subtype || !annotationTypes.has(subtype)) {
+          annotsToKeep.push(ref);
+        }
+      }
+
+      if (annotsToKeep.length > 0) {
+        const newAnnotsArray = pdfDoc.context.obj(annotsToKeep);
+        page.node.set(PDFName.of('Annots'), newAnnotsArray);
+      } else {
+        page.node.delete(PDFName.of('Annots'));
+      }
+    }
+  }
+}
+
 export async function removeAnnotations() {
   showLoader('Removing annotations...');
   try {
@@ -80,34 +122,7 @@ export async function removeAnnotations() {
     if (typesToRemove.size === 0)
       throw new Error('Please select at least one annotation type to remove.');
 
-    const pages = state.pdfDoc.getPages();
-
-    for (const pageIndex of targetPageIndices) {
-      const page = pages[pageIndex];
-      const annotRefs = page.node.Annots()?.asArray() || [];
-
-      const annotsToKeep = [];
-
-      for (const ref of annotRefs) {
-        const annot = state.pdfDoc.context.lookup(ref);
-        const subtype = annot
-          .get(PDFName.of('Subtype'))
-          ?.toString()
-          .substring(1);
-
-        // If the subtype is NOT in the list to remove, add it to our new array
-        if (!subtype || !typesToRemove.has(subtype)) {
-          annotsToKeep.push(ref);
-        }
-      }
-
-      if (annotsToKeep.length > 0) {
-        const newAnnotsArray = state.pdfDoc.context.obj(annotsToKeep);
-        page.node.set(PDFName.of('Annots'), newAnnotsArray);
-      } else {
-        page.node.delete(PDFName.of('Annots'));
-      }
-    }
+    removeAnnotationsFromDoc(state.pdfDoc, targetPageIndices, typesToRemove);
 
     const newPdfBytes = await state.pdfDoc.save();
     downloadFile(