Synchronized updates do not implement timeout

[alois31]

2. Issues with the Zellij UI / behavior / crash

Issue description

The implementation of the synchronized updates specification does not include a timeout. This will lead to the pane staying visually locked indefinitely when a program crashes while trying to perform a synchronized update.

Minimal reproduction

echo -e '\e[?2026h'

Other relevant information

The specification explicitly recommends a timeout to be implemented for the reason stated in this issue: https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec#timeout