Android developer for App Navigation, Database, UI Refactor and Codebase cleanup

Persist Navigation State Across Tab Switches Ensure that navigation history is retained when switching between tabs, allowing users to return to their previous position within each tab. Implement Navigation History Database Create a reliable local database layer to store and retrieve navigation history, following best practices for performance and maintainability. Implement Bookmarks Database Develop a database system for saving, retrieving, and managing user-created bookmarks within the app. Refactor App Navigation & Argument Handling Clean up and restructure the existing AppNav logic and argument-passing system for improved clarity, maintainability, and scalability. Fix UI Flash When Closing All Tabs Resolve an issue where the UI briefly flashes when all tabs are closed and the user is returned to the Home screen. Re-implement Bottom Navigation with Material 3 Replace the existing bottom navigation with a Material 3 implementation for improved design consistency, accessibility, and behavior. Remove Unwanted Logic & Legacy Files (Project Cleanup) Perform a full cleanup of the project, removing unused logic, legacy components, obsolete files, and any code that no longer aligns with the current architecture. My Files Page: Fetch Downloaded Media ← NEW Fetch all downloaded media files (videos and audio) from the device’s internal storage and display them inside the My Files section. Implement proper filtering options such as Videos / Audio, ensure smooth loading, and handle storage permissions as needed. Secret Folder: Move Media to Hidden Storage (and Vice Versa) Implement functionality to move selected media files (audio or video) from internal storage into a hidden Secret Folder located in external storage. Also support the reverse action: moving media from the Secret Folder back to normal storage so the files reappear inside the My Files section. Apply tot his job