feat: rewrite schema-driven widget system

src/WidgetSystem/WidgetRegistry.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace AKSRT\WidgetSystem;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Lazy, immutable registry for all modern widgets.
+ */
+final class WidgetRegistry {
+	/** @var array<string, WidgetDefinition>|null */
+	private static ?array $definitions = null;
+
+	/** @return array<string, WidgetDefinition> */
+	public static function all(): array {
+		if (self::$definitions === null) {
+			self::$definitions = [];
+			foreach (WidgetCatalog::definitions() as $raw) {
+				$definition = new WidgetDefinition($raw);
+				if (isset(self::$definitions[$definition->slug()])) {
+					throw new \LogicException('Duplicate widget slug: ' . $definition->slug());
+				}
+				self::$definitions[$definition->slug()] = $definition;
+			}
+		}
+		return self::$definitions;
+	}
+
+	public static function get(string $slug): ?WidgetDefinition {
+		return self::all()[$slug] ?? null;
+	}
+
+	public static function get_by_id_base(string $id_base): ?WidgetDefinition {
+		$prefix = 'aksrt_widget_';
+		if (!str_starts_with($id_base, $prefix)) {
+			return null;
+		}
+		return self::get(substr($id_base, strlen($prefix)));
+	}
+
+	public static function count(): int {
+		return count(self::all());
+	}
+
+	public static function reset(): void {
+		self::$definitions = null;
+	}
+}
+