Add a progress bar identicating how many fields have been filled

Could be in the menubar or sidebar.
Both as progressbar but maybe also as a word count or completed field count.

Start by locating the menubar and sidebar entry points in the R Shiny application and identify how field completion is represented. Done means the interface shows progress based on completed fields, with the desired presentation—progress bar, word count, or completed-field count—resolved.

Written by the indexing model from the issue text.