גיליונות של Calligra

The most significant changes are that Calligra has been fully transitioned to Qt6 and KF6, along with a major overhaul of its user interface.

As part of the Qt6 port, Sheets lost its scripting system based on the unmaintained Kross framework. Visually a noticable change is that the cell editor moved from a docker positioned on the left of the spreadsheet view by default to a normal widget on the top. This takes a lot less space which can be used by the spreadsheet.