test(vehicle): use a real state shape in the Summary test fixture

{:online, nil} was never a state the machine produces; since the atom-state refactor the online state is the plain :online atom.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: JakobLichterfeld

CHANGELOG.md

@@ -106,6 +106,7 @@ Existing charging processes are recomputed once during the upgrade migration: pr
 - build(deps): update flake.lock (#5560)
 - build(deps-dev): bump sass from 1.101.0 to 1.102.0 in /assets (#5566)
 - build(deps): bump leaflet-control-geocoder from 3.3.1 to 4.0.0 in /assets (#5565)
+- test(vehicle): make the store-position interval configurable and lock the state-machine field lifecycle with regression tests (#5259 - @JakobLichterfeld)
 
 #### Dashboards
 

test/teslamate/vehicles/vehicle/summary_test.exs

@@ -8,7 +8,7 @@ defmodule TeslaMate.Vehicles.Vehicle.SummaryTest do
 
   defp attrs do
     %{
-      state: {:online, nil},
+      state: :online,
       since: DateTime.utc_now(),
       healthy?: true,
       car: nil,