Migrate to mantine v6 (#15)

* Add letter spacing to cell text

* Set window control height in px

* Add temp unused routes

* Migrate text title font weights

* Bump mantine to v6 alpha

* Migrate modals / notifications

* Increase header bar to 65px

* Adjust play button props

* Migrate various components

* Migrate various pages and root styles

* Adjust default badge padding

* Fix sidebar spacing

* Fix list header badges

* Adjust default theme

src/renderer/features/playlists/components/playlist-detail-header.tsx

@@ -45,7 +45,7 @@ export const PlaylistDetailHeader = forwardRef(
           item={{ route: AppRoute.PLAYLISTS, type: LibraryItem.PLAYLIST }}
           title={detailQuery?.data?.name || ''}
         >
-          <Stack mt="1rem">
+          <Stack>
             <Group>
               {metadataItems.map((item, index) => (
                 <Fragment key={`item-${item.id}-${index}`}>