Planner|

The headline use case. Items bucket onto days by `getDate`, `sort` orders them within a cell, and the `cell` snippet renders your own markup. Because `cell` runs for empty days too, the “Add” button is available everywhere.

The same component in month view with a different domain type. Cells stay compact; weekend columns are tinted via highlightWeekend.

Restyle any slot (here the header and cells) via `slotClasses`, and track the active day with `bind:selectedDate` — `isSelected` reaches the cell snippet. Clicking a cell's body selects its day; clicks on interactive content keep their own behaviour.

Planner and a SvelteKit load function agree on the same week because both use the Svelte-free `@urbicon-ui/blocks/date` subpath — no UTC drift between server and client.