- Replace two MUI DatePicker components with a single visual range field
- Click opens Popover with community DateCalendar (no DateRangePicker/pro)
- First click sets start, second sets end; if end < start, range resets
- Remove isOpen/onToggle props — Popover managed locally
- Add BrokerDashboardTableSkeleton for events/income loading
- Set default weekly range (today-7d / today) for both events and income
- Remove 'Фильтр' label, rename 'Показать' → 'Применить период'
- Install @mui/x-date-pickers@7
- Update tests for new UI and skeleton loading states
- Align spec.md, plan.md, tasks.md with implementation
