feat(plex): selective user import (#2188)

* feat(api): allow importing of only selected Plex users

* feat(frontend): modal for importing Plex users

* feat: add alert if 'Enable New Plex Sign-In' setting is enabled

* refactor: fetch all existing Plex users in a single DB query

Co-authored-by: Ryan Cohen <ryan@sct.dev>

server/api/plextv.ts

@@ -224,7 +224,7 @@ class PlexTvAPI {
 
       const users = friends.MediaContainer.User;
 
-      const user = users.find((u) => Number(u.$.id) === userId);
+      const user = users.find((u) => parseInt(u.$.id) === userId);
 
       if (!user) {
         throw new Error(