- Added `import_tasks_from_email` method in `Cron` class to handle task imports from email.
- Created `MailToTaskImporter` class for processing emails and creating tasks based on their content.
- Updated configuration to include IMAP settings for email import.
- Enhanced `Tasks` class with a method to change the client associated with a task.
- Modified task details view to include a dropdown for selecting clients.
- Improved task timer functionality with separate start and stop functions.
- Added logic to handle task work duration validation.
- Updated JavaScript to manage task timers and client changes more effectively.
- Added JS Gantt Chart library files including CSS and JS.
- Updated existing Gantt chart styles for better visual representation.
- Translated month and day names to Polish in the Gantt chart settings.
- Implemented Gantt chart initialization in the main view with sample data.
- Added a toggle switch for displaying tasks in the calendar.
- Enhanced task edit form with a new checkbox for calendar visibility.
- Improved the layout of the logged-in user template to include Gantt chart styles and scripts.
