Widget config now multi-selects real lists (smart lists stay single-select, mutually exclusive) and offers an optional "group by list" sort that heads each list's tasks with its name. Closes #25 Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de> Reviewed-on: https://codeberg.org/jlmakiola/agendula/pulls/32