fix(builder): un-hide and relabel static-page content editor, warn on publish/remove-language

- KNOWN-ISSUES item 11: the WYSIWYG page content editor was buried inside
  a collapsed Advanced <details>, labeled 'Raw HTML (advanced)'. Moved it
  to the top of the Content tab, unwrapped, relabeled 'Page Content' /
  'Содержимое страницы' / 'Эջի բովանդակություն' with a plain-language
  description. Advanced tab keeps genuinely technical fields (id, slug,
  route, custom template).
- Publish (save-bar) and Remove language (languages-section) had no
  confirmation despite being destructive/high-impact — added
  window.confirm guards using the existing builder.confirm* i18n pattern
  (matches resetDraft/resetSection/dirty-guard precedent), all 3 locales.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/features/project-editor/components/save-bar/project-editor-save-bar.component.ts

@@ -37,7 +37,9 @@ export class ProjectEditorSaveBarComponent {
   }
 
   publish(): void {
-    this.facade.publish();
+    if (confirm(this.translate.t('builder.confirmPublish'))) {
+      this.facade.publish();
+    }
   }
 
   resetDraft(): void {

src/app/features/project-editor/sections/languages-section.component.ts

@@ -59,7 +59,9 @@ export class ProjectEditorLanguagesSectionComponent {
   }
 
   removeLocale(code: string): void {
-    this.facade.removeLocale(code);
+    if (confirm(this.translate.t('builder.confirmRemoveLanguage'))) {
+      this.facade.removeLocale(code);
+    }
   }
 
   setDefault(code: string): void {