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/twig/string-extra/LICENSE

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+Copyright (c) 2019-present Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/twig/string-extra/README.md

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+String Extension
+================
+
+This package is a Twig extension that provides integration with the Symfony
+String component. It provides the following filters:
+
+ * [`u`][1]: Wraps a text in a `UnicodeString` object to give access to
+[methods of the class][2].
+
+ * [`slug`][3]: Wraps the [`AsciiSlugger`][4]'s `slug` method.
+
+ * [`singular`][5] and [`plural`][6]: Wraps the [`Inflector`][7] `singularize`
+   and `pluralize` methods.
+
+[1]: https://twig.symfony.com/u
+[2]: https://symfony.com/doc/current/components/string.html
+[3]: https://twig.symfony.com/slug
+[4]: https://symfony.com/doc/current/components/string.html#slugger
+[5]: https://twig.symfony.com/singular
+[6]: https://twig.symfony.com/plural
+[7]: https://symfony.com/doc/current/components/string.html#inflector

vendor/twig/string-extra/StringExtension.php

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+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Extra\String;
+
+use Symfony\Component\String\AbstractUnicodeString;
+use Symfony\Component\String\Inflector\EnglishInflector;
+use Symfony\Component\String\Inflector\FrenchInflector;
+use Symfony\Component\String\Inflector\InflectorInterface;
+use Symfony\Component\String\Inflector\SpanishInflector;
+use Symfony\Component\String\Slugger\AsciiSlugger;
+use Symfony\Component\String\Slugger\SluggerInterface;
+use Symfony\Component\String\UnicodeString;
+use Twig\Error\RuntimeError;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+
+final class StringExtension extends AbstractExtension
+{
+    private $slugger;
+    private $englishInflector;
+    private $spanishInflector;
+    private $frenchInflector;
+
+    public function __construct(?SluggerInterface $slugger = null)
+    {
+        $this->slugger = $slugger ?: new AsciiSlugger();
+    }
+
+    public function getFilters(): array
+    {
+        return [
+            new TwigFilter('u', [$this, 'createUnicodeString']),
+            new TwigFilter('slug', [$this, 'createSlug']),
+            new TwigFilter('plural', [$this, 'plural']),
+            new TwigFilter('singular', [$this, 'singular']),
+        ];
+    }
+
+    public function createUnicodeString(?string $text): UnicodeString
+    {
+        return new UnicodeString($text ?? '');
+    }
+
+    public function createSlug(string $string, string $separator = '-', ?string $locale = null): AbstractUnicodeString
+    {
+        return $this->slugger->slug($string, $separator, $locale);
+    }
+
+    /**
+     * @return array|string
+     */
+    public function plural(string $value, string $locale = 'en', bool $all = false)
+    {
+        if ($all) {
+            return $this->getInflector($locale)->pluralize($value);
+        }
+
+        return $this->getInflector($locale)->pluralize($value)[0];
+    }
+
+    /**
+     * @return array|string
+     */
+    public function singular(string $value, string $locale = 'en', bool $all = false)
+    {
+        if ($all) {
+            return $this->getInflector($locale)->singularize($value);
+        }
+
+        return $this->getInflector($locale)->singularize($value)[0];
+    }
+
+    private function getInflector(string $locale): InflectorInterface
+    {
+        switch ($locale) {
+            case 'en':
+                return $this->englishInflector ?? $this->englishInflector = new EnglishInflector();
+            case 'es':
+                if (!class_exists(SpanishInflector::class)) {
+                    throw new RuntimeError('SpanishInflector is not available.');
+                }
+
+                return $this->spanishInflector ?? $this->spanishInflector = new SpanishInflector();
+            case 'fr':
+                return $this->frenchInflector ?? $this->frenchInflector = new FrenchInflector();
+            default:
+                throw new \InvalidArgumentException(\sprintf('Locale "%s" is not supported.', $locale));
+        }
+    }
+}

vendor/twig/string-extra/composer.json

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+{
+    "name": "twig/string-extra",
+    "type": "library",
+    "description": "A Twig extension for Symfony String",
+    "keywords": ["twig", "html", "string", "unicode"],
+    "homepage": "https://twig.symfony.com",
+    "license": "MIT",
+    "minimum-stability": "dev",
+    "authors": [
+        {
+            "name": "Fabien Potencier",
+            "email": "fabien@symfony.com",
+            "homepage": "http://fabien.potencier.org",
+            "role": "Lead Developer"
+        }
+    ],
+    "require": {
+        "php": ">=8.1.0",
+        "symfony/string": "^5.4|^6.4|^7.0|^8.0",
+        "symfony/translation-contracts": "^1.1|^2|^3",
+        "twig/twig": "^3.13|^4.0"
+    },
+    "require-dev": {
+        "symfony/phpunit-bridge": "^6.4|^7.0"
+    },
+    "autoload": {
+        "psr-4" : { "Twig\\Extra\\String\\" : "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
+    }
+}