fix(widgets): preserve badge HTML in icon card title/desc like reference theme

wp_kses_post() strips the custom <badge> element, so icon card title/desc
lost admin-authored markup (e.g. <badge class="ml6 jb-blue">GO</badge>)
both at save time and render time, diverging from the reference theme
which stores and echoes these fields raw.

- add shared inline whitelist (aksrt_icon_card_kses_tags/aksrt_icon_card_kses)
  and route both card renderers plus the media-brand fallback through it
- drop the dead unused $allow array in aksrt_icon_cover_card
- add 'rich_html' sanitize type (FieldSchema + SchemaProvider) and mark
  icon card title/desc fields in widget schemas, page display schema and
  the page config meta box save path
- align header slider card module with reference show_widget_bg branches
  (aksrt-panel/flex1 vs padding-10 wrapper/relative-h)
- update widget contract tests to pin the whitelist behavior

src/WidgetSystem/FieldSchema.php

@@ -85,12 +85,18 @@ final class FieldSchema {
 					? aksrt_sanitize_icon_value((string) $value)
 					: sanitize_text_field((string) $value);
 			case 'textarea':
+				if (($field['sanitize'] ?? '') === 'rich_html') {
+					return self::rich_inline_html((string) $value);
+				}
 				return !empty($field['allow_html']) ? wp_kses_post((string) $value) : sanitize_textarea_field((string) $value);
 			case 'text':
 			default:
 				if (($field['sanitize'] ?? '') === 'url') {
 					return esc_url_raw((string) $value);
 				}
+				if (($field['sanitize'] ?? '') === 'rich_html') {
+					return self::rich_inline_html((string) $value);
+				}
 				if (($field['sanitize'] ?? '') === 'ids') {
 					return implode(',', array_values(array_unique(array_filter(array_map('absint', preg_split('/[,，\s]+/', (string) $value))))));
 				}
@@ -103,6 +109,17 @@ final class FieldSchema {
 		}
 	}
 
+	/**
+	 * Inline rich-HTML sanitizer for admin-authored card title/desc fields.
+	 * `badge` and friends are not in WP's $allowedposttags, so wp_kses_post()
+	 * would strip the exact markup legacy/Zibll renders verbatim.
+	 */
+	private static function rich_inline_html(string $value): string {
+		return function_exists('aksrt_icon_card_kses')
+			? aksrt_icon_card_kses($value)
+			: wp_kses_post($value);
+	}
+
 	private static function empty_value(string $type) {
 		if ($type === 'switcher') {
 			return false;

src/WidgetSystem/WidgetSchemas.php

@@ -537,8 +537,8 @@ final class WidgetSchemas {
 				['id' => 'icon_class', 'type' => 'palette', 'label' => '图标样式', 'default' => 'c-yellow', 'options' => self::icon_background_palette(), 'dependency' => ['icon_radius', '!=', '']],
 				['id' => 'icon_color', 'type' => 'palette', 'label' => '图标颜色', 'default' => 'key-color', 'options' => self::icon_text_palette(), 'dependency' => ['icon_radius|icon_custom_color', '==|==', '|']],
 				['id' => 'icon_custom_color', 'type' => 'color', 'label' => '自定义图标颜色', 'default' => '', 'dependency' => ['icon_radius', '==', '']],
-				['id' => 'title', 'type' => 'textarea', 'label' => '文案标题', 'default' => '', 'allow_html' => true, 'attributes' => ['rows' => 1]],
-				['id' => 'desc', 'type' => 'textarea', 'label' => '文案简介', 'default' => '', 'allow_html' => true, 'attributes' => ['rows' => 2]],
+				['id' => 'title', 'type' => 'textarea', 'label' => '文案标题', 'default' => '', 'allow_html' => true, 'sanitize' => 'rich_html', 'attributes' => ['rows' => 1]],
+				['id' => 'desc', 'type' => 'textarea', 'label' => '文案简介', 'default' => '', 'allow_html' => true, 'sanitize' => 'rich_html', 'attributes' => ['rows' => 2]],
 			]],
 		];
 	}
@@ -550,8 +550,8 @@ final class WidgetSchemas {
 			['id' => 'show_widget_bg', 'type' => 'switcher', 'label' => '显示模块背景', 'default' => false],
 			['id' => 'icon_radius4', 'type' => 'switcher', 'label' => '方形图标', 'default' => false],
 			['id' => 'cards', 'type' => 'group', 'label' => '添加卡片', 'max_items' => 40, 'default' => [], 'fields' => [
-				['id' => 'title', 'type' => 'textarea', 'label' => '文案标题', 'default' => '', 'allow_html' => true, 'attributes' => ['rows' => 1]],
-				['id' => 'desc', 'type' => 'textarea', 'label' => '文案简介', 'default' => '', 'allow_html' => true, 'attributes' => ['rows' => 2]],
+				['id' => 'title', 'type' => 'textarea', 'label' => '文案标题', 'default' => '', 'allow_html' => true, 'sanitize' => 'rich_html', 'attributes' => ['rows' => 1]],
+				['id' => 'desc', 'type' => 'textarea', 'label' => '文案简介', 'default' => '', 'allow_html' => true, 'sanitize' => 'rich_html', 'attributes' => ['rows' => 2]],
 				['id' => 'icon', 'type' => 'icon', 'label' => '选择图标', 'default' => 'fa fas fa-magic'],
 				['id' => 'customize_icon', 'type' => 'textarea', 'label' => '自定义图标', 'default' => '', 'allow_html' => true, 'attributes' => ['rows' => 1]],
 				['id' => 'icon_class', 'type' => 'palette', 'label' => '图标颜色', 'default' => 'c-yellow', 'options' => self::icon_background_palette()],