fix: resolve container width issues, spa redirects, and appearance settings overwrite. feat: enhance order/sub details and newsletter layout

includes/Core/Notifications/ChannelRegistry.php

@@ -0,0 +1,107 @@
+<?php
+
+/**
+ * Channel Registry
+ * 
+ * Manages registration and retrieval of notification channels
+ * 
+ * @package WooNooW\Core\Notifications
+ */
+
+namespace WooNooW\Core\Notifications;
+
+use WooNooW\Core\Notifications\Channels\ChannelInterface;
+
+class ChannelRegistry
+{
+
+    /**
+     * Registered channels
+     * 
+     * @var array<string, ChannelInterface>
+     */
+    private static $channels = [];
+
+    /**
+     * Register a notification channel
+     * 
+     * @param ChannelInterface $channel Channel instance
+     * @return bool Success status
+     */
+    public static function register(ChannelInterface $channel)
+    {
+        $id = $channel->get_id();
+
+        if (empty($id)) {
+            return false;
+        }
+
+        self::$channels[$id] = $channel;
+        return true;
+    }
+
+    /**
+     * Get a registered channel by ID
+     * 
+     * @param string $channel_id Channel identifier
+     * @return ChannelInterface|null Channel instance or null if not found
+     */
+    public static function get($channel_id)
+    {
+        return self::$channels[$channel_id] ?? null;
+    }
+
+    /**
+     * Get all registered channels
+     * 
+     * @return array<string, ChannelInterface> Associative array of channel_id => channel_instance
+     */
+    public static function get_all()
+    {
+        return self::$channels;
+    }
+
+    /**
+     * Check if a channel is registered
+     * 
+     * @param string $channel_id Channel identifier
+     * @return bool True if channel exists
+     */
+    public static function has($channel_id)
+    {
+        return isset(self::$channels[$channel_id]);
+    }
+
+    /**
+     * Unregister a channel
+     * 
+     * @param string $channel_id Channel identifier
+     * @return bool Success status
+     */
+    public static function unregister($channel_id)
+    {
+        if (isset(self::$channels[$channel_id])) {
+            unset(self::$channels[$channel_id]);
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Get list of configured channel IDs
+     * 
+     * Only returns channels that are properly configured (is_configured() returns true)
+     * 
+     * @return array List of configured channel IDs
+     */
+    public static function get_configured_channels()
+    {
+        $configured = [];
+        foreach (self::$channels as $id => $channel) {
+            if ($channel->is_configured()) {
+                $configured[] = $id;
+            }
+        }
+        return $configured;
+    }
+}