Content Guidelines AI: fix remaining renamed-Gutenberg references

Two more leftovers from the Gutenberg content-guidelines -> guidelines
rename, outside inject.js so missed by #49155:

- suggestion-actions.jsx looked up the per-section form by the removed
  id `content-guidelines-${slug}`, so the effect bailed early: the
  original text was never captured for the diff and the form's
  has-jetpack-suggestion / is-jetpack-loading classes were never toggled
  (the underlying textarea stayed visible behind the suggestion). Switch
  to the stable `.guidelines__list-item[data-slug]` -> form lookup used
  by inject.js.

- style.scss targeted the removed `.content-guidelines__accordion-trigger`
  class to hide the badge when a section is expanded. The badge is now
  injected inside the CollapsibleCard trigger, which carries
  aria-expanded, so target `[aria-expanded="true"]` instead.

Both verified against the live page: the form resolves via data-slug and
the badge-hide selector matches only when the section is expanded.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: aagam-shah

projects/plugins/jetpack/_inc/content-guidelines-ai/components/suggestion-actions.jsx

@@ -23,7 +23,8 @@ export default function SuggestionActions( { slug } ) {
 	// a separate React root injected into Gutenberg's page — we can't control classes
 	// on Gutenberg-owned elements through React props.
 	useEffect( () => {
-		const form = document.getElementById( `content-guidelines-${ slug }` );
+		const item = document.querySelector( `.guidelines__list-item[data-slug="${ slug }"]` );
+		const form = item?.querySelector( 'form' );
 		if ( ! form ) {
 			return;
 		}

projects/plugins/jetpack/_inc/content-guidelines-ai/style.scss

@@ -110,11 +110,10 @@ $cg-diff-removed: #f8d7da;
 }
 
 // Badge in accordion headers.
-// Hide badge when accordion is expanded — the Accept/Dismiss
-// buttons inside already communicate the suggestion state.
-// stylelint-disable-next-line selector-max-compound-selectors
-.content-guidelines__accordion-trigger[aria-expanded="true"]
-.jetpack-content-guidelines-ai__badge-container {
+// Hide badge when the accordion is expanded — the Accept/Dismiss
+// buttons inside already communicate the suggestion state. The badge is
+// injected inside the CollapsibleCard trigger, which carries aria-expanded.
+[aria-expanded="true"] .jetpack-content-guidelines-ai__badge-container {
 	display: none;
 }