Show a persistent single-line progress counter ("Downloading track times
for car 1234/7589") while fetch_times downloads timing data. A ProgressBar
from indicatif 0.17 is sized to the car list, cloned into each spawned
download task, and incremented after fetch_car completes so it tracks
completions rather than starts; Arc internals make this safe under the
concurrent semaphore. The bar is cleared via finish_and_clear() before
the error/warning logging loop so retry messages don't garble the line,
and indicatif renders nothing when stderr is not a TTY.
Also apply pending rustfmt reformatting to src/capture/windows.rs
(formatting only, no logic changes).
