Fix: incorrect platform change card when changing vehicle

[sharhio]

Proposed Changes

• reset previous platform value between leg changes

Pull Request Check List

• A reasonable set of unit tests is included
• Console does not show new warnings/errors
• Changes are documented or they are self explanatory
• This pull request does not have any merge conflicts
• All existing tests pass in CI build

Review

• Read and verify the code changes
• Test the functionality by running the UI locally with all popular browsers available in your platform
• Check that the implementation matches the design, when such one is defined in an issue in Azure Boards
• Merge the pull request

[vesameskanen]

Incorrect warning still shows up occasionally - got it 4 times during 20 tests. Maybe the logic below is more obvious:

• Do not evaluate change status at all unless next leg is a transit leg
• RESTORED status can't be set unless CHANGED status is detected first

const platformRef = useRef();

  if (legChanged) {
    platformRef.current = undefined;
  }
  let platformStatus = PLATFORM_STATUS.NORMAL;
  if (nextLeg?.transitLeg) {
    platformStatus = getPlatformChangeStatus(nextLeg, platformRef.current);
    if (platformStatus === PLATFORM_STATUS.CHANGED) {
      platformRef.current = nextLeg.from.stop.platformCode;
    }
  }