fix: hero reveal — set bg inside pfp onload so cache is warm, no state machine

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

src/views/detail.js

@@ -119,41 +119,29 @@ export async function loadArtistDetail(artist) {
   const _bgCover = _firstAlbums[0] ? coverUrl(_firstAlbums[0].coverArt, 512) : null;
   const bgSrc = img || _bgCover;
 
-  // Reveal when images are ready; color tint fades in after (non-blocking)
-  let _pfpReady = false, _bgReady = false;
-  const _revealHero = () => {
-    if(!_pfpReady || !_bgReady) return;
-    requestAnimationFrame(() => { hero.style.transition = 'opacity 0.25s ease'; hero.style.opacity = '1'; });
-  };
-
-  if(bgSrc) {
-    hero.style.background = '';
-    const bgEl = document.getElementById('artist-hero-bg');
-    if(bgSrc === img) {
-      // same URL as pfp — browser cache will have it when pfp loads, no extra request
-      bgEl.style.backgroundImage = `url('${bgSrc}')`;
-      _bgReady = true;
-    } else {
-      const _bgPreload = new Image();
-      _bgPreload.onload = _bgPreload.onerror = () => { bgEl.style.backgroundImage = `url('${bgSrc}')`; _bgReady = true; _revealHero(); };
-      _bgPreload.src = bgSrc;
-    }
-  } else {
-    _bgReady = true;
-  }
+  const _revealHero = () => requestAnimationFrame(() => {
+    hero.style.transition = 'opacity 0.25s ease';
+    hero.style.opacity = '1';
+  });
 
   if(img) {
+    if(bgSrc) hero.style.background = '';
+    const bgEl = document.getElementById('artist-hero-bg');
     const pfpWrap = document.getElementById('artist-hero-pfp-wrap');
     if(pfpWrap) {
       const pfpImg = document.createElement('img');
       pfpImg.className = 'artist-hero-pfp';
       pfpImg.alt = '';
-      pfpImg.onload = pfpImg.onerror = () => { _pfpReady = true; _revealHero(); };
+      pfpImg.onload = pfpImg.onerror = () => {
+        // image is now in cache — set bg background-image here so it renders instantly
+        if(bgEl && bgSrc) bgEl.style.backgroundImage = `url('${bgSrc}')`;
+        _revealHero();
+      };
       pfpImg.src = img;
       pfpWrap.prepend(pfpImg);
       document.getElementById('artist-hero-pfp-initial')?.style.setProperty('display', 'none');
-    } else { _pfpReady = true; }
-    // color tint is non-blocking — fades in via CSS whenever it's ready
+    }
+    // color tint — non-blocking, fades in via CSS
     _extractColor(img).then(rgb => {
       if(!rgb) return;
       const [r, g, b] = rgb;
@@ -164,7 +152,15 @@ export async function loadArtistDetail(artist) {
       if(overlay) hero.insertBefore(tint, overlay);
       requestAnimationFrame(() => { tint.style.opacity = '1'; });
     });
-  } else { _pfpReady = true; _revealHero(); }
+  } else if(bgSrc) {
+    hero.style.background = '';
+    const bgEl = document.getElementById('artist-hero-bg');
+    const _pre = new Image();
+    _pre.onload = _pre.onerror = () => { if(bgEl) bgEl.style.backgroundImage = `url('${bgSrc}')`; _revealHero(); };
+    _pre.src = bgSrc;
+  } else {
+    _revealHero();
+  }
 
   // ── Bio ──
   const info = infoRes.status === 'fulfilled' ? infoRes.value?.artistInfo2 : null;