Side drawer — used for the OSS-catalog filters and the mobile menu.

```jsx
<Sheet open={open} onOpenChange={setOpen} side="right" width={380}>
  <SheetHeader><SheetTitle>Filters</SheetTitle></SheetHeader>
  <SheetContent><Checkbox label="Open source" /></SheetContent>
</Sheet>
```

Square corners against the viewport edge; no radius. Full-height only.