Disable mobile zoom: add maximum-scale viewport + global touch-action manipulation

index.html

@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
 <meta charset="UTF-8">
-<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover, user-scalable=no">
+<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, viewport-fit=cover, user-scalable=no">
 <meta name="apple-mobile-web-app-capable" content="yes">
 <meta name="mobile-web-app-capable" content="yes">
 <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">

style.css

@@ -42,6 +42,7 @@ html, body, #app {
   user-select: none;
   -webkit-touch-callout: none;
   -webkit-tap-highlight-color: transparent;
+  touch-action: manipulation;
 }
 
 /* ─── BODY ───────────────────────────────────────────────── */