Log Message:
py-textual: update to 0.86.3.

0.86.3

Changed

    Updated the tutorial (text and code) #5257

Fixed

    Fixed a glitch with the scrollbar that occurs when you hold a to add \ 
stopwatches in the tutorial app #5257

[0.86.2] - 2024-11-18

Fixed

    Fixed visibility glitch for widgets with an offset #5253
    Fixed theme variables being unavailable in code until refresh_css was called \ 
#5254