9f89cb17a0
5.1: Toolbar already has PluginToolbar with navigation, view mode, actions — no changes needed 5.2: Calendar visibility toggle fix: - calendarStore.setCalendars now initializes visibleCalendarIds with all calendar IDs - CalendarTree.tsx visibility check simplified to visibleCalendarIds.has(cal.id) - No more empty-set-means-all-visible confusion tsc clean