Tasks widgets could only ever point at one CalDAV task list (a radio- button picker, owner-only). Now they merge any number of included task lists across every linked user, same checkbox-inclusion + optional pinned-color shape a calendar widget already has for its calendars -- FrameTaskList mirrors FrameCalendar exactly, down to the same owner- adds/anyone-mutes permission split (api_widget_task_list_select/ api_widget_task_list_color). Reused calendar_render._event_colors/ _draw_color_bar as-is for the per-task color bar -- a task dict's owner_display_name/color_index is exactly that function's single- source fallback shape. Also added an opt-in "show tasks completed in the last 24 hours" toggle (TaskWidgetConfig.show_completed): caldav_client.fetch_tasks now accepts a completed_since cutoff and returns completed VTODOs (with their completion time) instead of silently dropping them, and _draw_tasks gives a completed task a filled checkbox + muted text instead of the normal empty-box/due-date row. Migration 18 splits the single-source TaskWidgetConfig columns (added by 17, splitting tasks out of the calendar widget in the first place) into frame_task_lists, carrying forward each widget's existing single source as its first included list -- same shape migration 9 used carrying forward frame_calendars' old single opt-in. Verified live in the browser (desktop + mobile): the new "Included task lists" + "Recently completed" dialog sections, the show_completed toggle actually persisting through a real HTTP round-trip, and no regression in the calendar widget's own "Included calendars" dialog. Full suite (192 tests, including new merge_tasks/config_save/migration coverage) passes.