iOS focus-zoom prevention — input font-size floor @ 16px ; JS fallback strengthened

Belt-and-suspenders for the iOS Safari auto-zoom-on-input quirk: Mobile Safari zooms the viewport when an `<input>`/`<textarea>`/`<select>` is focused & its computed font-size < 16px, and never zooms back out on blur. Two layers ; PRIMARY — SCSS prevention: new `input, textarea, select, [contenteditable] { font-size: unquote("max(16px, 1em)") }` in core.scss (Sass can't reconcile px/em units in compile-time max() so unquote() passes the CSS max() through verbatim — modern browsers handle natively). 1em inherits parent, max() floors at 16. ALSO floored `.form-control-lg` in _base.scss — was `font-size: 1.125rem`, which at rem=14 (small portrait, clamp(14px, 2.4vmin, 22px) hits its floor) computes to 15.75px → **0.25px** under iOS's 16px threshold → the "ever so slightly" zoom on New Game + New Post applets the user reported (both use `.form-control.form-control-lg`, specificity 0,2,0 beats my element-level 0,0,1 rule). Floor: `unquote("max(16px, 1.125rem)")` ; SECONDARY — JS fallback in base.html: rewritten from `setAttribute('content', ...)` toggle to full meta-element remove+re-add, which modern iOS handles more reliably than attribute mutations on the existing meta. Triggers on document-level `focusout` (bubbles natively, no capture-phase needed) for `input/textarea/select`; injects fresh viewport meta w. `maximum-scale=1.0, user-scalable=no` for 300ms (iOS reads as zoom violation → snaps to 1:1), then swaps back to the cached base content so pinch-zoom remains available elsewhere ; user observed horizontal scrollbar appearing when the page zoomed — that's the symptom the user actually cared about (broken layout, not aesthetic zoom). w. SCSS floor in place the zoom shouldn't trigger to begin with; the JS is purely for inputs that slip through (future custom controls, shadow DOM, etc.) ; iOS-specific behavior — Selenium+Firefox doesn't replicate the auto-zoom so no FT layer added. Verified by user manual iPhone test (post-fix retest pending after force-refresh)

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/static_src/scss/_base.scss

@@ -159,7 +159,11 @@ body {
             &.form-control-lg {
                 --_pad-v: 0.75rem;
                 padding: var(--_pad-v) 1rem;
-                font-size: 1.125rem;
+                // 1.125rem at rem=14 (small portrait clamp floor) is 15.75px
+                // — just under iOS Safari's 16px auto-zoom threshold. Floor
+                // at 16px to prevent the focus-zoom; native CSS max() handles
+                // the unit mix Sass can't reconcile at compile time.
+                font-size: unquote("max(16px, 1.125rem)");
             }
 
             &.is-invalid ~ .invalid-feedback {