Add Task Sorting Options

[Rohit-554]

Description:
Users need ability to sort tasks by different criteria (date, priority, status, alphabetical).

Tasks:

• Create sort options enum (Date, Priority, Status, Alphabetical)
• Add sorting UI in task screen
• Implement sorting logic in TaskScreenViewModel
• Store sort preference using DataStore
• Add sort indicator in UI

Files to explore:

• TaskScreenViewModel.kt
• TaskScreen.kt
• Create new sort options component