Sidebar entry position fix
v1.5.21 inserted the Achievements entry next to whatever .navMenuOption was first on the page, which on sidebars with other plugins installed (e.g. Kevin Tweaks) wasn't Jellyfin's own plugin section — so Achievements ended up buried under the wrong header.
The injector now walks every .navMenuOption, text-matches "Plugin Settings" / "Plugin Pages", and inserts ours directly after that item. Fallbacks: the Home item, then the first nav item as last resort.