UI: Refactor DateTime formatting and selection handling

[ksharma-xyz]

TL;DR

Refactored date-time handling and selection functionality to improve code organization and reusability.

What changed?

• Renamed date/time formatting functions to be more descriptive (formatDate -> toReadableDate, formatTime -> to12HourTimeString)
• Moved DateTimeSelectionItem and JourneyTimeOptions to the state module
• Added documentation to time formatting functions
• Added date-time selection handling to TimeTableViewModel
• Added comma separator in date format for better readability

How to test?

1. Open the date-time selector screen
2. Verify date formats display correctly (Today, Tomorrow, Mon, 1 Jan)
3. Verify time formats display in 12-hour format (1:30 PM)
4. Test journey time options (Leave/Arrive) work correctly
5. Confirm date-time selection updates properly in the time table view

Why make this change?

• Improves code organization by moving date-time related logic to appropriate modules
• Makes the code more maintainable with better-named functions and documentation
• Enhances readability of displayed dates with consistent formatting
• Centralizes date-time selection handling in the ViewModel for better state management

[ksharma-xyz]

• UI: Refactor DateTime formatting and selection handling #403 👈 (View in Graphite)
• UI: Add DateTime support to trip planning API #402
• UI: Refactor DateTime selection to use serialized model #401
• main

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[ksharma-xyz]

Merge activity

• Nov 30, 8:18 AM EST: A user merged this pull request with Graphite.