Refine export summary logic to exclude empty task categories

Add export summary feature for task completion status

Improve task addition logic to prevent duplicate entries on blur event

Update database schema to allow nullable start dates for tasks and enhance task management features

Remove database files for Potok project, including main database and associated WAL and SHM files, to clean up unused resources.

Refactor app layout and enhance drag-and-drop functionality

Add self-registration feature and notes support for tasks

Rename project from "Potok" to "Neuron" and update related configurations. Change service name in docker-compose, update environment variables, and modify README for new user management features. Adjust database schema to support user roles and implement password hashing. Update frontend to reflect new branding and user account functionalities.

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