RunnerDustProgress

Branded progress: the Rarámuri LottieRunner runs along a track, the DustTrail kicking up behind it. The runner's position is the progress —

• progress 0f..1f → the runner advances to that point and a bright accent fill highlights the distance covered.

• null → the runner runs in place at the start (legs still animate, but it does NOT crawl across and reset) — we never fake motion we can't measure.

Public; the labelled variant is WalletSyncIndicator.