feat(creator-studio): portal dropdowns, hidden content, two-step block delete

Toolbar
- New ToolMenu renders menus through a portal on body, so they are no longer
  clipped by the horizontally scrolling toolbar and no longer fall back to a
  native <select>. Triggers reuse .jio-creator__tool-btn geometry, fixing the
  heading button's mismatched height/size/position.
- Heading / list / align / quote / hidden-content are all dropdowns.
- Lists: unordered + ordered via InsertOrderedList/InsertUnorderedList.
  The TOC button is removed (it also used the wrong icon).
- Adds left / center / right alignment.
- Adds hidden content: comment / login / VIP / paid, wired to the existing
  [reply], [jio_hide mode="login"], [vip] and [payshow] shortcodes.

Editor content
- Quote blocks now match the live article: full .quote_q structure, four
  colour variables, and an SVG-mask quote mark that does not depend on the
  Font Awesome font being present inside the iframe.
- Block math is centred on a transparent background instead of a full-width
  grey bar.
- Code blocks are plain <pre><code>, identical to the article page; language
  and theme selection is gone and EnlighterJS handles highlighting globally.
  The classic submit editor's code modal follows the same shape.
- Hidden content reuses the .tinymce-hide structure and shows a readable label
  while keeping the shortcode text in the DOM for saving.

Block deletion
- Two-step delete, WPS style: the first click only selects and highlights the
  block, the second click removes it. Clicking elsewhere or Esc cancels.

Contracts updated and extended; 884 widget-system tests pass.

assets/creator-studio/src/utils/serialize.ts

@@ -1,8 +1,9 @@
 /**
  * 编辑器内容 ↔ 保存格式的转换。
  *
- * 编辑器里把公式、注释、代码语言标签渲染成可读的样子（方便写作时看到最终效果），
- * 但落库必须回到短代码/纯标记，服务端才能稳定渲染。这里在两个方向上都做一次转换。
+ * 编辑器里把公式、注释渲染成可读的样子（方便写作时看到最终效果），
+ * 但落库必须回到短代码，服务端才能稳定渲染。隐藏内容与代码块本身就是
+ * 短代码 / 前台结构，不需要转换。
  *
  * @package Jio
  */
@@ -20,7 +21,7 @@ const decodeEntities = (value: string): string => {
  * 保存前：把编辑器里的可视化块换回短代码 / 纯标记。
  */
 export function serializeBlocks(html: string): string {
-	if (!html || (html.indexOf('data-jio-') === -1 && html.indexOf('jio-code-lang') === -1)) {
+	if (!html || html.indexOf('data-jio-') === -1) {
 		return html;
 	}
 
@@ -46,9 +47,6 @@ export function serializeBlocks(html: string): string {
 		node.replaceWith(document.createTextNode(`[jio_footnote]${note}[/jio_footnote]`));
 	});
 
-	// 代码块语言角标只是编辑期提示
-	container.querySelectorAll('.jio-code-lang').forEach((node) => node.remove());
-
 	return container.innerHTML;
 }