Add explicit "Leave At" time to Trip Planner results

[diveshpatil9104]

Fixes #143

Summary

This PR updates the TripPlannerResults list to explicitly display the Departure Time ("Leave at") for each itinerary option. Previously, users only saw the Duration and Arrival Time (ETA), forcing them to do mental math to figure out when to leave the house.

Changes

• Modified: ItineraryPreviewView.swift
• Update: Added an HStack to display Leave at: [startTime] • Arrive: [endTime].
• Styling: Used secondary foreground styles to maintain visual hierarchy, keeping the Duration as the primary focus.

Screenshots

Before	After

[aaronbrethorst]

hi thanks for your contribution!

• change to "Depart:" and "Arrive:"
• Make both times .medium
• Use localization keys or at least update the the string tables with empty placeholders

[diveshpatil9104]

Thanks for the feedback. I made the following changes:

• Switched labels to Depart: and Arrive: using OTPLoc keys.
• Added translations for en, es, and zh-Hans.
• Updated the start and end times to use .fontWeight(.medium).

[aaronbrethorst]

nice work @diveshpatil9104!

[aaronbrethorst]

@diveshpatil9104 tests are failing :(

[diveshpatil9104]

I noticed that too. I checked the logs and the failures are in TripPlannerViewModelTests, which I didn't modify in this PR. 🥲Since this seems to be a pre-existing issue unrelated to the UI changes..

[aaronbrethorst]

@diveshpatil9104 duly noted!

[diveshpatil9104]

@aaronbrethorst Thanks for the quick merge!
Just wanted to mention something I noticed while looking into the logs - it seems like TripPlannerViewModelTests uses a short 0.2s sleep to wait for the network. Since the tests appear to be hitting the real API, I'm not sure, but that short timeout might be why it's flaky on the CI server compared to local. 🙄