Stop the mobile focus zoom on text fields

poc/public/style.css

@@ -2136,3 +2136,30 @@ a.vk-attachment:hover {
         right: calc(50% - 26px);
     }
 }
+
+/* ── Mobile form controls ─────────────────────────────────────────────────────
+   iOS Safari zooms the whole page when a focused text field renders below 16px,
+   and it does not always zoom back out when the field loses focus. Force 16px
+   on text-entry controls at the mobile breakpoint, stop the landscape text
+   inflation, and drop the double-tap zoom delay on controls. Sliders, check-
+   boxes, and radios keep their current sizing (they never trigger focus zoom,
+   and em-based slider thumbs must keep their own font size). */
+html {
+    -webkit-text-size-adjust: 100%;
+    text-size-adjust: 100%;
+}
+
+input,
+textarea,
+select,
+button {
+    touch-action: manipulation;
+}
+
+@media (max-width: 768px) {
+    input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="file"]),
+    textarea,
+    select {
+        font-size: 16px !important;
+    }
+}