feat(creator-studio): icon toolbar with block tools, drop author strip

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/widget-system/post-visual-contract.test.cjs

@@ -708,7 +708,7 @@ test('single articles enqueue only content and settings driven assets', () => {
     assert.match(singleBlock, new RegExp(`singular_assets\\['${requirement}'\\]`));
   }
 
-  assert.match(runtime, /\$requirements\['has_toc'\] = \$is_article && \$article_nav_enabled/);
+  assert.match(runtime, /\$requirements\['has_toc'\] = \$is_article && \(\$article_nav_enabled \|\| \$has_inline_toc\)/);
   assert.match(runtime, /data-jio-video/);
   assert.match(runtime, /post_password_required\(\$post_id\)/);
   assert.match(runtime, /comment_settings\['close_comments'\]/);