feat(creator-studio): multi-select category picker and creatable tag input

分类从平铺复选标签改为带搜索的多选下拉（触发器内是已选令牌），
标签改为令牌输入框：回车 / 逗号 / 顿号 / 分号 / 换行切分，输入时列出
站点已有标签作为建议，面板内可一键新建。

- 抽出 useAnchoredPanel，工具条下拉与新的选择器共用同一套 portal 定位
- bootstrap 的 tags 增加 suggestions（按使用量取前 200 个已有标签）
- 清理 .jio-creator-inline 与 chip 内的死样式

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

tests/widget-system/creator-studio-contract.test.cjs

@@ -477,6 +477,36 @@ test('writing surface is a centered paper card with a publish settings card belo
 	assert.doesNotMatch(drawer, /jio-creator-captcha/);
 });
 
+test('publish settings use a multi-select category picker and a creatable tag input', () => {
+	const settings = read('assets/creator-studio/src/components/publish-settings.tsx');
+	const category = read('assets/creator-studio/src/components/category-select.tsx');
+	const tag = read('assets/creator-studio/src/components/tag-input.tsx');
+	const styles = read('assets/creator-studio/src/styles/_publish-drawer.scss');
+
+	// 分类：带搜索的多选下拉，触发器里是已选令牌。
+	assert.match(settings, /<CategorySelect/);
+	assert.match(category, /createPortal/);
+	assert.match(category, /type="checkbox"/);
+	assert.match(category, /onChange\(/);
+	assert.match(category, /选择分类（可多选）/);
+	// 旧的分类平铺复选列表已移除（自定义分类法仍是复选标签，不受影响）。
+	assert.doesNotMatch(settings, /toggleCategory/);
+	assert.doesNotMatch(settings, /categories\.includes\(/);
+
+	// 标签：可直接新建，并展示站点已有标签作为建议。
+	assert.match(settings, /<TagInput/);
+	assert.match(tag, /新建标签/);
+	assert.match(tag, /站点已有标签/);
+	assert.match(tag, /SEPARATORS/);
+	assert.match(tag, /Backspace/);
+	assert.doesNotMatch(styles, /\.jio-creator-inline\s*\{/);
+
+	// 服务端把已有标签作为建议下发，前端只读。
+	assert.match(creatorRest, /'suggestions'\s*=>/);
+	assert.match(creatorRest, /'taxonomy'\s*=>\s*'post_tag'/);
+	assert.match(appSource, /suggestions: \(bootstrap\.tags && bootstrap\.tags\.suggestions\)/);
+});
+
 test('scheduled publishing is validated and applied server side', () => {
 	const save = read('src/Core/FrontSubmitSave.php');
 	const rest = read('src/Core/CreatorRest.php');