Handle no start time -> use created time instead

[pauljones0]

Preview Workflow and Testing Improvements

Addresses bounty #60 by enhancing the preview #99 workflow with things not caught before, and adding test coverage.

Changes

Testing

• Added Vitest unit tests for RouteHeader component to verify date/time handling, these should run automatically in the CI/CD pipeline

Dependencies

• Added Prettier plugin for Tailwind CSS to improve formatting consistency

Date Handling

• Updated route date formatting to handle missing start times gracefully
• Falls back to creation time when start time is unavailable

GitHub Actions

• Cleaned up formatting and documentation in workflow files

Code Style

• Improved responsive layout for cards:
  • Flex row layout on larger screens
  • Flex column layout on mobile
  • Centered card alignment
  • Increased bottom margin for "load more" button

Testing

All tests pass locally and in CI. The preview deployment workflow has been verified with multiple test runs.

[github-actions]

deployed preview: https://109.connect-d5y.pages.dev

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[adeebshihadeh]

This PR is massive. Can you split it up?

[pauljones0]

@adeebshihadeh yeah I can split it apart. Give me a day or so

[knownotunknown]

Hey @pauljones0, just a heads up, but I think you may have misunderstood the requirements:

Requirements

hide the date/time
show "timeless" routes in the correct order with the rest of routes

The goal is to use the create_time for ordering, not to use it to display date/time in the same way you'd display start_time.