UI: Add DateTime support to trip planning API

[ksharma-xyz]

TL;DR

Added support for departure/arrival time selection in trip planning

What changed?

• Extended the trip planning API to support departure and arrival time preferences
• Added new parameters for date (YYYYMMDD) and time (HHMM) in the trip planning service
• Introduced a DepArr enum to handle departure/arrival preferences
• Added utility functions in DateTimeSelectionItem to format date and time
• Updated TimeTableViewModel to incorporate user-selected date/time preferences

How to test?

1. Set a departure or arrival time in the date/time selector
2. Plan a trip between two stops
3. Verify that the returned journeys respect the selected time preference
4. Test both departure and arrival scenarios
5. Verify date/time formatting matches the required format (YYYYMMDD for date, HHMM for time)

Why make this change?

To provide users with more control over their journey planning by allowing them to specify whether they want to arrive by or depart at a specific time, rather than only showing current departure times.

[ksharma-xyz]

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

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[ksharma-xyz]

Merge activity

• Nov 30, 12:37 AM EST: A user merged this pull request with Graphite.