Shadoks visibles : opacités ×3, tailles augmentées, fonds moins noirs

- Opacités Shadoks : 0.1 → 0.25-0.35 (enfin visibles)
- Tailles SVG augmentées (clamp min/max relevés de 20-40%)
- Fix pumper hors écran (right: -15% → 3%)
- Footer pattern : opacités internes ×3
- Fonds palettes dark éclaircis (bg 4% → 7%, surface 9% → 12%)

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

app/components/home/SongsPreview.vue

@@ -83,12 +83,12 @@ const featuredSongs = computed(() => bookData.getSongs().slice(0, 6))
 
 .shadok-musician {
   position: absolute;
-  right: 3%;
-  top: 5%;
-  width: clamp(90px, 12vw, 170px);
-  opacity: 0.1;
+  right: 2%;
+  top: 4%;
+  width: clamp(110px, 15vw, 210px);
+  opacity: 0.28;
   pointer-events: none;
-  color: hsl(var(--color-primary));
+  color: hsl(var(--color-accent));
   animation: shadok-float-musician 8s ease-in-out infinite;
 }