fix: prevent '?' shortcut from intercepting input in code editors

This adds a guard to the global keydown listener in book.js so that the '?' shortcut does not intercept keypresses when the user is focused inside an input, textarea, or Ace editor block.

Fixes #3064

Author: kartik-py12

crates/mdbook-html/front-end/js/book.js

@@ -654,6 +654,17 @@ aria-label="Show hidden lines"></button>';
         if (window.search && window.search.hasFocus()) {
             return;
         }
+        const target = e.target;
+        // Do not intercept shortcuts when the user is typing in an input element or code editor
+        if (
+            target.tagName === 'INPUT' ||
+            target.tagName === 'TEXTAREA' ||
+            target.isContentEditable ||
+            target.closest && target.closest('.ace_editor')
+        ) {
+            return;
+        }
+
         const html = document.querySelector('html');
 
         function next() {