feat: add JSON to PDF and PDF to JSON conversion tools

- Introduced new pages and logic for converting JSON files to PDF and vice versa.
- Implemented web workers for handling conversion processes in the background.
- Updated Vite configuration to include new HTML pages for the conversion tools.
- Enhanced user interface with file upload sections and status messages for conversion progress.
- Added TypeScript definitions for worker communication and response handling.

public/workers/json-to-pdf.worker.d.ts

@@ -0,0 +1,20 @@
+declare const coherentpdf: typeof import('../../src/types/coherentpdf.global').coherentpdf;
+
+interface ConvertJSONToPDFMessage {
+  command: 'convert';
+  fileBuffers: ArrayBuffer[];
+  fileNames: string[];
+}
+
+interface JSONToPDFSuccessResponse {
+  status: 'success';
+  pdfFiles: Array<{ name: string; data: ArrayBuffer }>;
+}
+
+interface JSONToPDFErrorResponse {
+  status: 'error';
+  message: string;
+}
+
+type JSONToPDFResponse = JSONToPDFSuccessResponse | JSONToPDFErrorResponse;
+