Implement Navigation Drawer with Profile, Submissions, and Change Handle, etc

Introduce a side Navigation Drawer (hamburger menu) to serve as a hub for secondary actions.

Start by locating the app's existing screen and navigation setup, then review how secondary actions are currently exposed. Implement a hamburger-menu drawer containing Profile, Submissions, and Change Handle, along with any additional actions defined by the project. Done means the drawer opens reliably and each listed destination or action is reachable.

Written by the indexing model from the issue text.