Deploy a modern mobile web app using Vercel that functions as both a PDF viewer and editor with the following features:
1. **Bilingual Support**: The app should support both Spanish and English languages, with a language switcher at the top of the interface.
2. **PDF Viewing**:
- Allow users to **upload and view PDF files** with features like smooth scrolling, zooming, page navigation, and a full-screen mode.
- Provide a **dark mode** toggle to enable comfortable reading in low-light environments.
3. **PDF Editing Options**:
- **Merge PDFs**: Allow users to select multiple PDF files and merge them into a single document. Include a feature to reorder pages before merging.
- **Split PDFs**: Provide tools to split a PDF into multiple smaller documents by selecting specific pages or page ranges.
- **Save PDFs**: Enable users to save edited or newly created PDFs locally on their device or in the cloud.
4. **Modern UI/UX**: Design a user-friendly interface optimized for | A shadcn/ui and v0 generation - v0
