Create the work plan for 2026 (Arbetsplanering 2026).

The first version was created in 2025 and will be updated in February 2026: https://docs.google.com/spreadsheets/d/1d0XBDUqHfd1g1sG9xJIfypVyYB34WlXRwdo2cyh5f-Q/edit?gid=0#gid=0

After a stable version is done we will create a copy for the staff that they can use for their planning.