* fix(outbound): preserve backticks on <code> tags with attributes
The plain-text sanitizer only matched bare <code> openers, so attributed
variants such as <code class="language-ts"> lost their backtick wrapping
and were stripped to raw text before channel delivery.
Allow optional attributes on the opening <code> tag, consistent with the
existing handling for <h[1-6]> and <li> in the same function.
Fixes#104117
* fix(outbound): preserve attributed inline formatting
Co-authored-by: chengzhichao-xydt <chengzhichao-xydt@users.noreply.github.com>
* test(outbound): compact attributed tag coverage
* fix(outbound): normalize attributed formatting tags
* docs(outbound): clarify attribute normalization invariant
* fix(outbound): preserve native formatting semantics
* docs(plugin-sdk): document sanitizer markup styles
* docs(plugin-sdk): refresh docs map
---------
Co-authored-by: moguangyu5-design <moguangyu5-design@users.noreply.github.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
Co-authored-by: chengzhichao-xydt <chengzhichao-xydt@users.noreply.github.com>
aa12e71de7