Use branded StreamHoard placeholder for missing movie/show artwork

AlbumArt was music-only until now; movies and series grids/detail views
still showed a broken-image icon when poster_url/backdrop_url was empty.
Reused the same component (movies library grid, series grid + resume
strip, show detail backdrop, movie detail modal backdrop) instead of
duplicating the placeholder logic.

frontend/src/pages/ShowDetail.jsx

@@ -2,6 +2,7 @@ import { useEffect, useState, useMemo } from "react";
 import { useParams, useNavigate } from "react-router-dom";
 import api from "../lib/api";
 import { Play, ArrowLeft } from "lucide-react";
+import AlbumArt from "../components/AlbumArt";
 
 export default function ShowDetail() {
   const { id } = useParams();
@@ -27,7 +28,7 @@ export default function ShowDetail() {
   return (
     <div className="min-h-screen bg-[#050505]" data-testid={`show-detail-${show.id}`}>
       <div className="relative h-[60vh] min-h-[400px] overflow-hidden">
-        <img src={show.backdrop_url || show.poster_url} alt="" className="absolute inset-0 w-full h-full object-cover" />
+        <AlbumArt url={show.backdrop_url || show.poster_url} className="absolute inset-0" />
         <div className="absolute inset-0 hero-fade" />
         <button onClick={() => nav(-1)} className="absolute top-24 left-6 md:left-12 flex items-center gap-2 text-white/80 hover:text-white bg-black/40 hover:bg-black/60 px-4 py-2 backdrop-blur transition-colors" data-testid="show-back">
           <ArrowLeft size={16} strokeWidth={1.5} /> <span className="text-xs uppercase tracking-[0.2em]">Back</span>

frontend/src/pages/Shows.jsx

@@ -2,6 +2,7 @@ import { useEffect, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import api from "../lib/api";
 import { Tv } from "lucide-react";
+import AlbumArt from "../components/AlbumArt";
 
 export default function Shows() {
   const [shows, setShows] = useState([]);
@@ -51,7 +52,7 @@ export default function Shows() {
                   <button key={episode.id} onClick={() => nav(`/watch/episode/${episode.id}`)}
                     className="relative shrink-0 w-[260px] group focus:outline-none" data-testid={`continue-ep-${episode.id}`}>
                     <div className="aspect-video overflow-hidden bg-[#0F0F0F] transition-transform duration-300 group-hover:scale-105">
-                      <img src={show.backdrop_url || show.poster_url} alt="" className="w-full h-full object-cover" />
+                      <AlbumArt url={show.backdrop_url || show.poster_url} />
                     </div>
                     <div className="absolute bottom-0 left-0 right-0 h-[3px] bg-white/10">
                       <div className="h-full bg-[#D9381E]" style={{ width: `${pct}%` }} />
@@ -70,7 +71,7 @@ export default function Shows() {
             <button key={s.id} onClick={() => nav(`/show/${s.id}`)}
               className="group shrink-0 aspect-[2/3] overflow-hidden bg-[#0F0F0F] transition-transform duration-300 hover:scale-105 focus:outline-none focus:ring-2 focus:ring-[#D9381E]"
               data-testid={`show-card-${s.id}`}>
-              <img src={s.poster_url || s.backdrop_url} alt={s.title} loading="lazy" className="w-full h-full object-cover" />
+              <AlbumArt url={s.poster_url || s.backdrop_url} loading="lazy" />
               <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black to-transparent p-3 opacity-0 group-hover:opacity-100 transition-opacity duration-300">
                 <p className="text-white text-sm truncate">{s.title}</p>
                 <p className="text-[10px] uppercase tracking-[0.2em] text-[#8A8A8A]">{s.season_count} seasons · {s.episode_count} eps</p>