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/components/dropdown-menu/index.tsx

@@ -63,7 +63,6 @@ const StyledMenuItem = styled(MantineMenu.Item)<MenuItemProps>`
   & .mantine-Menu-itemLabel {
     color: ${(props) => (props.$danger ? 'var(--danger-color)' : 'var(--dropdown-menu-fg)')};
     font-weight: 500;
-    font-size: 1em;
   }
 
   & .mantine-Menu-itemRightSection {