Stop the mobile focus zoom on text fields

CURRENT.md

@@ -40,6 +40,12 @@ mobile draft at 390px.
   - [x] C11 preview caching: Discord-hosted image/GIF previews (WebP 320px, hash-addressed, 5 MiB
     cap, one attempt) run after every walk in both modes. Live run `...-20260916090722`:
     `previewed: 2`; thumbs served over `/api/media/<scrape>/<item>/thumb` (200).
+  - [x] C79 Mobile form controls and the focus zoom. iOS Safari zooms the page when a focused
+    text field renders below 16px and does not always zoom back out. `style.css` now forces 16px
+    on text-entry controls at the mobile breakpoint (25 fields were under 16px, the smallest 11px),
+    sets `text-size-adjust: 100%`, and adds `touch-action: manipulation` to controls. Sliders keep
+    their own font size so em-based thumbs do not resize; desktop sizes are unchanged. Verified at
+    390px: no field under 16px, no horizontal overflow, desktop still 13.5px.
   - [x] C78 Chat starts on the newest message. `renderMessages` pins the scroll when the channel
     changes or the user is already at the bottom, re-pins on the next frame and after 120/400 ms,
     and re-pins on late image loads while pinned. `overflow-anchor: none` on `.vk-message-scroll`

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;
+    }
+}