* fix(chapterthumbs): add software HDR tone-map fallback * fix(chapterthumbs): tighten filter capability detection * fix(chapterthumbs): harden tone-map fallback retries * fix(chapterthumbs): coalesce filter probes * fix(chapterthumbs): name disabled accelerator * feat(chapterthumbs): add CPU tone-map toggle * fix(config): reuse CPU tone-map setting key --------- Co-authored-by: Quick104 <31828688+Quick104@users.noreply.github.com>