New cron job sheet with schedule presets, cron validation and a next runs preview

reui/sheet-13

Create form for a scheduled command: preset chips, a cron input read back in plain words, owner, service and cluster pickers, and a first run time. ReUI Badge; shadcn Sheet, ToggleGroup, InputGroup, Select, Switch. Cron job form, task scheduler.

Paid component: its registry needs a licence from the library, so install it from their site.