Show odometer reading for trips

While I try to record my mileage manually, for days where I forget I use the trip logging here to approximate what my mileage should be. I do the math to add/subtract the distance travelled. It would be really cool and useful to me to have the trip logging show the odometer reading from my OBD-II data alongside the trip view.

Start by locating the trip logging view and the existing OBD-II data flow. Confirm how odometer readings are stored or exposed, then define done as displaying the relevant reading alongside each trip so it can support manual mileage calculations.

Written by the indexing model from the issue text.