Pickers

All pickers live in src/lib/ui/pickers/. They cover entity selection, colour and date input, file upload, and locale switching.

Component	File	Purpose
ActivityPicker	ActivityPicker.tsx	Single or multi-select picker for activities. Supports template-type filtering (org-level vs activity-specific). Accepts a custom trigger element and surfaces selected items as chips.
ColorPicker	ColorPicker.tsx	Icon button that opens a Popover containing a SketchPicker. Returns a hex colour string via onChangeComplete. Highlights the button when the field is compulsory and empty.
DatePicker	DatePicker.tsx	Locale-aware MUI date picker with dynamic dayjs locale loading. Enforces a 6-month minimum selectable range. Wraps standard MUI DatePicker props.
FilePicker	FilePicker.tsx	Drop-zone + file selector dialog. Supports async file verification, configurable accept and maxSize, a custom confirm button slot, and extra action items alongside the standard Choose / Cancel controls.
LanguagePicker	LanguagePicker.tsx	Locale switcher in the app navbar. Renders the current locale's flag and label. Org admins get an additional "edit supported languages" modal. Reads org and locale context — accepts no props.
OrganizationPicker	OrganizationPicker.tsx	Multi-select picker for contract partner organisations. Items render with a coloured header. Accepts a custom trigger element and closes the menu after each selection.
OuPicker	OuPicker.tsx	Single-select picker for organisational units. Shows a confirmation dialog when changing the OU of an existing activity. Skips confirmation for new activities.
PartnerDnDPicker	PartnerDnDPicker.tsx	Dialog-based drag-and-drop configurator with three droppable zones: Available, Processors, and Controllers. Validates that at least one processor or controller is assigned before applying.