fix(comments): restore syntax highlighting for comment code blocks

Comment [code] blocks rendered as bare <pre><code> with only Bootstrap's
grey box — no syntax colours, unlike the reference.

The runtime gates EnlighterJS on `_win.highlight_kg`, which was hardcoded to
false. With that false the selector degrades to `pre code.gl, pre code.special`,
and comment code carries neither class, so it never highlighted. The admin
already exposes 「全局功能 → 代码高亮」 (default on), and jioData.codeHighlight
reads it — only the runtime payload disagreed.

- _win.highlight_kg / highlight_hh / highlight_zt (plus white/dark theme
  names) now come from Settings::get_code_highlight_config(); the initial
  theme follows cookie → mode → time-auto via initial_theme_mode()
- define those values before the _win localize (it sits above jioData in the
  same method)
- inject the reference's two head rules the runtime path was missing:
  max-height from `highlight_maxheight`, and
  `.enlighter-toolbar{display:none}` when `highlight_btn` is off

Tests: comment-image-upload contract gains cases pinning the settings-backed
booleans (and their definition order) and the two inline CSS rules; suite
837/838 with the pre-existing frontend-lifecycle failure.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Core/ScriptsPart1b.php

@@ -49,6 +49,24 @@ trait ScriptsPart1b {
             wp_add_inline_style('jio-public', '.lazyloaded{--lazy-animation:lazy_scale!important;}');
         }
 
+        // 代码高亮的「最大高度」与「扩展按钮」由后台设置驱动。runtime 的
+        // enlighter 路径（评论区 [code] 等）不走 precode.js，需要这两条规则兜底。
+        if (class_exists('\Jio\Settings\Settings')) {
+            $code_highlight_css = \Jio\Settings\Settings::get_code_highlight_config();
+            if (!empty($code_highlight_css['enabled'])) {
+                $max_height_css = (int) $code_highlight_css['maxHeight'];
+                if ($max_height_css > 0) {
+                    wp_add_inline_style(
+                        'jio-public',
+                        '.enlighter-default .enlighter,.wp-block-code:not(:has(.enlighter)),.enlighter-pre:not(:has(.enlighter)){max-height:' . $max_height_css . 'px;overflow-y:auto !important;}'
+                    );
+                }
+                if (empty($code_highlight_css['showButtons'])) {
+                    wp_add_inline_style('jio-public', '.enlighter-toolbar{display:none !important;}');
+                }
+            }
+        }
+
         $core_dep = 'jio-public';
 
         $deps = [$core_dep];