How to add a "Weekly Summary" column to bjcalendar

@buggyj

At present there are seven columns to a row in bjcalendar:
Sun Mon Tue Wed Thu Fri Sat

How do I modify the code to get eight columns to a row?
Sun Mon Tue Wed Thu Fri Sat “Weekly Summary”

(I use your calendar in my journal for past events, but the option to do this would be very useful even if one used the calendar for future events - they could just change “Weekly Summary” to “Weekly Goals”)

Each Weekly Summary square would:

  1. Display the week number at the top like so: Week 28 (in bold)

  2. Display the contents of that week’s Weekly Summary tiddler.

Perhaps the Weekly Summary Tiddlers could be any tiddler with a “week-summary” field containing a date like so: 202528 (where 28 is the ISO-8601 week number of year - https://tiddlywiki.com/#DateFormat)

I am really enjoying your calendar. Thank you so much for creating it.