feat: add initial project setup with core PDF tools and utilities

- Implement core PDF manipulation tools (split, merge, convert, etc.)
- Add state management and UI utilities
- Set up build configuration with Vite and TailwindCSS
- Include essential dependencies for PDF processing
- Add gitignore and basic project configuration files

src/js/logic/scan-to-pdf.ts

@@ -0,0 +1,4 @@
+// This is essentially the same as image-to-pdf.
+import { imageToPdf } from './image-to-pdf.js';
+
+export const scanToPdf = imageToPdf;