Fixed an issue where PDFs and other files were opening in third-party apps by implementing in-app file handling and preview functionality.

### 🛠️ In-App PDF & Document Handling Improvement

---

* Fixed an issue where PDFs and other document files were opening in external third-party applications instead of within the app.
* Investigated existing file handling logic and navigation flow to identify the cause of external app redirection.
* Implemented in-app file handling to enable seamless viewing of PDFs and supported document formats.
* Integrated an in-app PDF preview solution to improve user experience.
* Ensured secure and efficient file loading without requiring users to leave the application.
* Reduced dependency on third-party apps, improving overall user flow and consistency.
* Handled edge cases such as download states, loading indicators, and unsupported file formats.
* Optimized performance for large PDF and document files.
* Tested the implementation across Android and iOS platforms to ensure consistent behavior.
* Enhanced overall usability by keeping all document interactions fully within the app.

---