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/now-playing/components/now-playing-header.tsx

@@ -9,8 +9,8 @@ export const NowPlayingHeader = () => {
     <PageHeader>
       <Group p="1rem">
         <TextTitle
-          fw="bold"
           order={3}
+          weight={700}
         >
           Queue
         </TextTitle>