Implement navigation args

[pxp9]

This implements the arguments that will be passed to a screen, it also stores arguments from previous screens so it will go back to the same state.

For testing you should add these lines in top_level.ex

  # Insert Calendar after Weather with a test date (24 feb)
  test_date = Date.new!(2026, 2, 24)
  List.insert_at(@base_screens, 4, {Screen.Calendar, "Calendar", %{selected_date: test_date}})

• implemented a custom param in calendar which opens the calendar in a specific date

Using default calendar , Lunar calendar.

When writing this is 15 February