An option to remember the reading point

I don't know if it is possible to save in the configuration the most recent tooth read when we close the browser tab.

That way, when we log in again later, it would position us on that tooth and we could read everything we have missed.

No files, tests, or entry points are named. Start by locating where the current toot-reading position and logged-in user state are managed, then trace how state survives navigation or reloads. Done means the next session restores the most recently read toot and still allows missed content to be read.

Written by the indexing model from the issue text.