Create Safe Seating

Fixed

• Mob safety no longer applies instantly on sitting down; it now waits for the same ~10 second grace period as the resting perks before blocking new mob targeting, on both stationary seats and contraptions.

Changed

• Reworded DESCRIPTION.md to match the mob safety grace-period behavior above, and restored the project image, "Dev note" list, and "Other Mods by me" section.