Fix: global keydown hotkeys ate letters while typing in the name input

R/N/P/F/G/W/A/S/D and arrows all preventDefault()'d unconditionally,
even with focus in #settings-name-input — swallowed those letters
mid-typing (very noticeable for English names). Skip the hotkey handler
entirely when an <input> is focused.

php/index.php

@@ -2065,6 +2065,10 @@ function draw() {
 // ============ ВВОД ============
 const keys = {};
 window.addEventListener('keydown', e => {
+  // фокус в текстовом поле (например, ввод имени) — не перехватываем хоткеи,
+  // иначе R/N/P/F/G/W/A/S/D и стрелки режут буквы прямо во время печати
+  if (document.activeElement && document.activeElement.tagName === 'INPUT') return;
+
   const key = e.key.toLowerCase();
 
   if (key === 'escape' && (solveState || pendingSolution)) { cancelAutoSolve(); e.preventDefault(); return; }