Add font library advanced commands (list-families, list-categories, install)

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

src/Font_Collection_Command.php

@@ -284,17 +284,24 @@ public function list_families( $args, $assoc_args ) {
 		// Filter by category if specified.
 		$category = \WP_CLI\Utils\get_flag_value( $assoc_args, 'category' );
 		if ( $category ) {
-			$font_families = array_filter(
-				$font_families,
-				function ( $family ) use ( $category ) {
-					$categories = isset( $family['category'] ) ? (array) $family['category'] : array();
-					return in_array( $category, $categories, true );
+			$filtered = array();
+			foreach ( $font_families as $family ) {
+				if ( ! is_array( $family ) ) {
+					continue;
 				}
-			);
+				$categories = isset( $family['category'] ) ? (array) $family['category'] : array();
+				if ( in_array( $category, $categories, true ) ) {
+					$filtered[] = $family;
+				}
+			}
+			$font_families = $filtered;
 		}
 
 		$items = array();
 		foreach ( $font_families as $family ) {
+			if ( ! is_array( $family ) ) {
+				continue;
+			}
 			$category_list = isset( $family['category'] ) ? (array) $family['category'] : array();
 			$items[]       = array(
 				'slug'       => isset( $family['slug'] ) ? $family['slug'] : '',

src/Font_Face_Command.php

@@ -466,7 +466,7 @@ public function install( $args, $assoc_args ) {
 			'post_parent'  => $family_id,
 			'post_title'   => $title,
 			'post_status'  => 'publish',
-			'post_content' => wp_json_encode( $face_settings ),
+			'post_content' => wp_json_encode( $face_settings ) ?: '{}',
 		);
 
 		$font_face_id = wp_insert_post( $post_data, true );