refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/league/uri/UriResolver.php

@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri;
+
+use Deprecated;
+use League\Uri\Contracts\UriInterface;
+use Psr\Http\Message\UriInterface as Psr7UriInterface;
+
+/**
+ * @deprecated since version 7.0.0
+ * @codeCoverageIgnore
+ * @see BaseUri
+ */
+final class UriResolver
+{
+    /**
+     * Resolves a URI against a base URI using RFC3986 rules.
+     *
+     * This method MUST retain the state of the submitted URI instance, and return
+     * a URI instance of the same type that contains the applied modifications.
+     *
+     * This method MUST be transparent when dealing with error and exceptions.
+     * It MUST not alter or silence them apart from validating its own parameters.
+     */
+    #[Deprecated(message:'use League\Uri\BaseUri::resolve() instead', since:'league/uri:7.0.0')]
+    public static function resolve(Psr7UriInterface|UriInterface $uri, Psr7UriInterface|UriInterface $baseUri): Psr7UriInterface|UriInterface
+    {
+        return BaseUri::from($baseUri)->resolve($uri)->getUri();
+    }
+
+    /**
+     * Relativizes a URI according to a base URI.
+     *
+     * This method MUST retain the state of the submitted URI instance, and return
+     * a URI instance of the same type that contains the applied modifications.
+     *
+     * This method MUST be transparent when dealing with error and exceptions.
+     * It MUST not alter or silence them apart from validating its own parameters.
+     */
+    #[Deprecated(message:'use League\Uri\BaseUri::relativize() instead', since:'league/uri:7.0.0')]
+    public static function relativize(Psr7UriInterface|UriInterface $uri, Psr7UriInterface|UriInterface $baseUri): Psr7UriInterface|UriInterface
+    {
+        return BaseUri::from($baseUri)->relativize($uri)->getUri();
+    }
+}