feat(toc): implement table of contents generation feature

- Added a new page for generating a table of contents from PDF bookmarks.
- Introduced a web worker to handle the TOC generation process in the background.
- Updated TypeScript definitions for coherentpdf integration.
- Enhanced the Vite configuration to include necessary headers and exclude specific dependencies.
- Modified tsconfig to include WebWorker library and updated file inclusion paths.
- Added a new script for handling TOC logic and user interactions.

public/workers/table-of-contents.worker.d.ts

@@ -0,0 +1,22 @@
+declare const coherentpdf: typeof import("../../src/types/coherentpdf.global").coherentpdf;
+
+interface GenerateTOCMessage {
+  command: 'generate-toc';
+  pdfData: ArrayBuffer;
+  title: string;
+  fontSize: number;
+  fontFamily: number;
+  addBookmark: boolean;
+}
+
+interface TOCSuccessResponse {
+  status: 'success';
+  pdfBytes: ArrayBuffer;
+}
+
+interface TOCErrorResponse {
+  status: 'error';
+  message: string;
+}
+
+type TOCResponse = TOCSuccessResponse | TOCErrorResponse;

public/workers/table-of-contents.worker.js

@@ -0,0 +1,57 @@
+self.importScripts('/coherentpdf.browser.min.js');
+
+function generateTableOfContentsInWorker(
+  pdfData,
+  title,
+  fontSize,
+  fontFamily,
+  addBookmark
+) {
+  try {
+    const uint8Array = new Uint8Array(pdfData);
+    const pdf = coherentpdf.fromMemory(uint8Array, '');
+
+    coherentpdf.startGetBookmarkInfo(pdf);
+    const bookmarkCount = coherentpdf.numberBookmarks();
+    coherentpdf.endGetBookmarkInfo();
+
+    if (bookmarkCount === 0) {
+      coherentpdf.deletePdf(pdf);
+      self.postMessage({
+        status: 'error',
+        message: 'This PDF does not have any bookmarks. Please add bookmarks first using the Bookmark tool.',
+      });
+      return;
+    }
+
+    coherentpdf.tableOfContents(pdf, fontFamily, fontSize, title, addBookmark);
+    const outputBytes = coherentpdf.toMemory(pdf, false, false);
+    const outputBytesBuffer = outputBytes.buffer;
+    coherentpdf.deletePdf(pdf);
+
+    self.postMessage(
+      {
+        status: 'success',
+        pdfBytes: outputBytesBuffer,
+      },
+      [outputBytesBuffer]
+    );
+  } catch (error) {
+    self.postMessage({
+      status: 'error',
+      message: error instanceof Error ? error.message : 'Unknown error occurred during table of contents generation.',
+    });
+  }
+}
+
+self.onmessage = (e) => {
+  if (e.data.command === 'generate-toc') {
+    generateTableOfContentsInWorker(
+      e.data.pdfData,
+      e.data.title,
+      e.data.fontSize,
+      e.data.fontFamily,
+      e.data.addBookmark
+    );
+  }
+};