Migliora il layout mobile delle sezioni home

MethodSteps passa a una sola colonna con step in orizzontale, PartnersStrip
riduce loghi e spaziature, TrainingCards ridimensiona testi e padding.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/components/home/PartnersStrip.astro

@@ -16,4 +16,9 @@ const imgOf = (name: string) => Object.entries(images).find(([p]) => p.includes(
   .pstrip { background: var(--c-accent); padding-block: 40px; }
   .pstrip__in { display: flex; align-items: center; justify-content: space-around; gap: 30px; flex-wrap: wrap; }
   .pstrip img { height: 44px; width: auto; opacity: .9; }
+  @media (max-width: 767px) {
+    .pstrip { padding-block: 28px; }
+    .pstrip__in { justify-content: center; gap: 20px 28px; }
+    .pstrip img { height: 30px; }
+  }
 </style>