kate522andClaude Opus 5
5afa7ab9df
fix(submit): show body placeholder on first load and restore caret on blank clicks
两个前台投稿编辑器的缺陷，根因都在占位符的实现方式：
1. 首次加载不显示占位符，输入一个再删掉才出现。
旧实现往正文插了一个 data-mce-bogus 占位段落，而 TinyMCE 在
setContent（studio 初始化时必调）与清理 bogus 元素时会把它移除。
2. 光标在块级结构里时，点击正文空白处无法落回正文。
占位段落占着首行、且 pointer-events:none，点击落不到可编辑元素上；
正文以表格 / 代码块这类结构块结尾时也没有可承载光标的段落。
改为 front-submit-editor-basics.js（替换 front-submit-placeholder.js）：
- 占位符改成 body 属性 + content CSS 的 ::before，正文 DOM 不含占位节点；
- 点击空白处（事件目标是 body）且光标不在普通文本里时，补一个可编辑尾段
并把光标放进去；
- 两份 content CSS 让 html/body 撑满编辑区，studio 的 syncEditorHeight
以编辑器声明高度为下限，空正文时 iframe 不会缩成一行。
新增 tests/widget-system/submit-placeholder-behavior.test.cjs（jsdom 跑真实插件）。
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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