fix(ui): the Plex detail poster keeps its 2:3, and a long crew shows its first names

The hero's grid row is as tall as the crew column beside the text, and the poster, a flex child,
stretched to it: a 2:3 picture drawn ~175x590 and cropped. It now aligns to the top, and a wide hero
gives the movie and show poster a bigger rung (w-56). The crew, the hero's tallest part, shows its
first 6 names and a 'Show N more' toggle; a list of 8 or fewer shows whole.

frontend/src/components/PlexInfo.tsx

@@ -9,6 +9,7 @@ import { notifyActionError } from "../lib/actionErrors";
 import { DetailCustomizeMenu, Filterable, PrefToggle } from "./plexDetailUi";
 import { DetailAside, DetailAsideToggles, DetailKeywords } from "./plexDetailAside";
 import {
+  DETAIL_POSTER,
   tmdbBackdropUrl,
   useCrossfadeBackdrop,
   useDetailAside,
@@ -366,7 +367,7 @@ export default function PlexInfo({
               <img
                 src={detail.thumb}
                 alt=""
-                className={`shrink-0 rounded-xl border border-border object-cover ${overlay ? "w-24 sm:w-28" : "w-32 sm:w-44"} aspect-2/3`}
+                className={`shrink-0 self-start rounded-xl border border-border object-cover ${overlay ? "w-24 sm:w-28" : DETAIL_POSTER} aspect-2/3`}
               />
 
               <div className={`min-w-0 flex-1 ${overlay ? "text-white/90" : ""}`}>