apply player color to Shorts progress bar

[KunalTiwari-git]

Closes #2748

Changes

• Extended existing player color CSS rule in player.css to also apply to the Shorts progress bar
• Targets both ytProgressBarLineProgressBarPlayed and YtProgressBarLineProgressBarPlayedRefresh classes for full compatibility

Testing

• Set Player → Progress bar color to any color (e.g. yellow/blue)
• Verified Shorts progress bar now matches the selected color
• Verified default red is unchanged when no color is selected

[improvedtube-backup]

hi! @KunalTiwari-git thank you, please don't close. I like to hoard all PRs and finish them even if much later. Every effort may be so valuable, while volunteer effort is scarce. (Sorry with the flood of (undisclosed-)LLM we can't always tell easily what is going on)
Thanks!

[KunalTiwari-git]

Hi! Sorry about that — I accidentally deleted my fork. I'll re-fork the repo and resubmit the PR with the same changes