perf: show artist hero after 2 fast calls instead of waiting for all 6

Split the allSettled into two phases: await imgP+albumP first (both are
fast — getArtistImage hits S.artistImgCache when navigating from the
listing, getArtist is a local Navidrome call), then reveal the hero.
The slow calls (getArtistInfo2 / Last.fm bio, iTunes search, events)
keep running in parallel and are only awaited when rendering the content
sections below the hero — so the user sees the hero card immediately.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/views/detail.js

@@ -86,16 +86,21 @@ export async function loadArtistDetail(artist) {
   const hasND       = !!artist.id;
   const knownItunes = artist.itunesArtistId || null;
 
-  const [imgRes, albumRes, infoRes, topRes, iArtistRes, eventsRes] = await Promise.allSettled([
-    hasND ? getArtistImage(artist.id)                                          : Promise.resolve(null),
-    hasND ? api('getArtist',    `&id=${artist.id}`)                            : Promise.resolve(null),
-    hasND ? api('getArtistInfo2',`&id=${artist.id}&count=8`)                   : Promise.resolve(null),
-    hasND ? api('getTopSongs',  `&artist=${encodeURIComponent(artist.name)}&count=10`) : Promise.resolve(null),
-    knownItunes
-      ? Promise.resolve([{ artistId: knownItunes }])
-      : itunesSearch(artist.name, 'musicArtist', 5),
-    fetchEvents(artist.name),
-  ]);
+  // Fire all requests immediately so they run in parallel.
+  // Hero only needs imgP + albumP (both fast / usually cached) — await those
+  // first so the hero appears instantly without waiting for iTunes or events.
+  const imgP     = hasND ? getArtistImage(artist.id)                                            : Promise.resolve(null);
+  const albumP   = hasND ? api('getArtist',     `&id=${artist.id}`)                             : Promise.resolve(null);
+  const infoP    = hasND ? api('getArtistInfo2',`&id=${artist.id}&count=8`)                     : Promise.resolve(null);
+  const topP     = hasND ? api('getTopSongs',   `&artist=${encodeURIComponent(artist.name)}&count=10`) : Promise.resolve(null);
+  const iArtistP = knownItunes ? Promise.resolve([{ artistId: knownItunes }]) : itunesSearch(artist.name, 'musicArtist', 5);
+  const eventsP  = fetchEvents(artist.name);
+
+  // Phase 1 — hero (fast: image usually cached from listing, getArtist is local)
+  const [imgRes, albumRes] = await Promise.allSettled([imgP, albumP]);
+
+  // Phase 2 — content (may be slow: Last.fm bio, iTunes, events)
+  const [infoRes, topRes, iArtistRes, eventsRes] = await Promise.allSettled([infoP, topP, iArtistP, eventsP]);
 
   const _normWords = s => new Set((s || '').toLowerCase().replace(/[^a-z0-9]/g, ' ').split(/\s+/).filter(Boolean));
   const _queryWords = _normWords(artist.name);