feat: add favicon and web app manifest support

- Introduced new favicon files: apple-touch-icon.png, favicon-96x96.png, favicon.ico, favicon.svg.
- Updated auth-request.php to include new favicon paths in the whitelist.
- Added web app manifest files: web-app-manifest-192x192.png, web-app-manifest-512x512.png, and created a manifest.json structure in ThemeHelper.
- Refactored DefaultPageLayout to include favicon links and manifest reference.

This update enhances the application's branding and improves the user experience on mobile devices.

emhttp/plugins/dynamix/include/DefaultPageLayout/Favicon.php

@@ -0,0 +1,11 @@
+<?php
+$docroot = $docroot ?? $_SERVER['DOCUMENT_ROOT'] ?: '/usr/local/emhttp';
+
+$themeHelper->checkManifestFile();
+?>
+
+<link type="image/png" rel="shortcut icon" href="/webGui/images/<?= _var($var, 'mdColor', 'red-on') ?>.png">
+<link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96" />
+<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
+<meta name="apple-mobile-web-app-title" content="<?= _var($var, 'NAME') ?>" />
+<link rel="manifest" href="/manifest.json" />