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/symfony/console/Helper/TableCellStyle.php

@@ -0,0 +1,84 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console\Helper;
+
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+
+/**
+ * @author Yewhen Khoptynskyi <khoptynskyi@gmail.com>
+ */
+class TableCellStyle
+{
+    public const DEFAULT_ALIGN = 'left';
+
+    private const TAG_OPTIONS = [
+        'fg',
+        'bg',
+        'options',
+    ];
+
+    private const ALIGN_MAP = [
+        'left' => \STR_PAD_RIGHT,
+        'center' => \STR_PAD_BOTH,
+        'right' => \STR_PAD_LEFT,
+    ];
+
+    private array $options = [
+        'fg' => 'default',
+        'bg' => 'default',
+        'options' => null,
+        'align' => self::DEFAULT_ALIGN,
+        'cellFormat' => null,
+    ];
+
+    public function __construct(array $options = [])
+    {
+        if ($diff = array_diff(array_keys($options), array_keys($this->options))) {
+            throw new InvalidArgumentException(\sprintf('The TableCellStyle does not support the following options: \'%s\'.', implode('\', \'', $diff)));
+        }
+
+        if (isset($options['align']) && !\array_key_exists($options['align'], self::ALIGN_MAP)) {
+            throw new InvalidArgumentException(\sprintf('Wrong align value. Value must be following: \'%s\'.', implode('\', \'', array_keys(self::ALIGN_MAP))));
+        }
+
+        $this->options = array_merge($this->options, $options);
+    }
+
+    public function getOptions(): array
+    {
+        return $this->options;
+    }
+
+    /**
+     * Gets options we need for tag for example fg, bg.
+     *
+     * @return string[]
+     */
+    public function getTagOptions(): array
+    {
+        return array_filter(
+            $this->getOptions(),
+            fn ($key) => \in_array($key, self::TAG_OPTIONS) && isset($this->options[$key]),
+            \ARRAY_FILTER_USE_KEY
+        );
+    }
+
+    public function getPadByAlign(): int
+    {
+        return self::ALIGN_MAP[$this->getOptions()['align']];
+    }
+
+    public function getCellFormat(): ?string
+    {
+        return $this->getOptions()['cellFormat'];
+    }
+}