feat: enhance UI components and improve date handling across the application

- Updated .env.sample to remove hardcoded SMTP credentials for better security.
- Refactored CSS styles in various components for a more consistent look, including background color changes.
- Added robust date parsing and formatting functions to improve date handling in task and project components.
- Enhanced task and project modals with improved button styles and accessibility features.
- Implemented new date-related features in Kanban and List views to display due dates and statuses more effectively.
- Improved user experience in team and project management components with better visual feedback and interactions.

Author: asepindrak