Jul 24 - Update Rich-text editor to enhance table editor 3

CLAUDE.md

@@ -127,6 +127,11 @@ shows only `is_published` topics (sections with no published topics are hidden).
   custom wiring. Init is guarded by `typeof QuillTableBetter` so a failed vendor
   load still leaves a working editor + textarea. Registration and keyboard bindings
   (`QuillTableBetter.keyboardBindings`) live in `topic_form.html`.
+  - **Save/load round-trip (critical):** save with `deleteTableTemporary()` then
+    `quill.getSemanticHTML()`. **Load must NOT use `dangerouslyPasteHTML`/`setContents`**
+    — quill-table-better renders tables *blank* that way. Instead convert then apply:
+    `quill.updateContents(quill.clipboard.convert({html}), 'user')`. The non-table
+    fallback path still uses `dangerouslyPasteHTML`.
 - **Sanitize on save:** `sanitize_html()` (bleach) runs on every `body_html`
   write — `ALLOWED_TAGS`/`ALLOWED_ATTRS` cover `img` + full table tags with
   `colspan/rowspan/data-*/style`; a `CSSSanitizer` (bleach[css] + `tinycss2`)