Migrating 0.0.5 → 0.0.6

Bits UI was removed in 0.0.6; overlays moved to @floating-ui/dom plus the in-tree behaviors.

Most APIs are unchanged. The breaking changes:

<Drawer> is gone. Use <Sheet side="left">; Sheet now defaults to 'right', so pass the side you want.
<RichTooltip> is gone. Use <Tooltip rich>.

<PreviewCard> is gone. Use <Tooltip rich> with the trigger as a link:

Tooltip(rich!="{true}" content="...")
    +snippet('trigger')
        a(href="/profile") @daniel

<ContextMenu> no longer renders nested submenus. The children field on items is accepted but ignored.
The scopeToProject wrapper in svelte.config.js is no longer needed. It existed only to keep svelte-preprocess from corrupting Bits UI's TypeScript source; remove it.