fix: prevent iOS auto-zoom on input focus by overriding Tailwind text-sm

Move the 16px font-size rule outside @layer base and scope it to iOS
via @supports (-webkit-touch-callout: none) so it takes priority over
Tailwind utility classes without affecting desktop rendering.

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

src/styles/globals.css

@@ -118,11 +118,14 @@ body.no-pinch-zoom * {
     font-family: var(--font-ui);
   }
 
-  /* Empêche le zoom automatique iOS sur les inputs */
+}
+
+/* Empêche le zoom automatique iOS sur les inputs (hors @layer pour surcharger text-sm) */
+@supports (-webkit-touch-callout: none) {
   input,
   textarea,
   select {
-    font-size: 16px;
+    font-size: 16px !important;
   }
 }