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/squizlabs/php_codesniffer/tests/FileList.php

@@ -0,0 +1,98 @@
+<?php
+/**
+ * Class to retrieve a filtered file list.
+ *
+ * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
+ * @copyright 2019 Juliette Reinders Folmer. All rights reserved.
+ * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests;
+
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use RegexIterator;
+
+class FileList
+{
+
+    /**
+     * The path to the project root directory.
+     *
+     * @var string
+     */
+    protected $rootPath;
+
+    /**
+     * Recursive directory iterator.
+     *
+     * @var \DirectoryIterator
+     */
+    public $fileIterator;
+
+    /**
+     * Base regex to use if no filter regex is provided.
+     *
+     * Matches based on:
+     * - File path starts with the project root (replacement done in constructor).
+     * - Don't match .git/ files.
+     * - Don't match dot files, i.e. "." or "..".
+     * - Don't match backup files.
+     * - Match everything else in a case-insensitive manner.
+     *
+     * @var string
+     */
+    private $baseRegex = '`^%s(?!\.git/)(?!(.*/)?\.+$)(?!.*\.(bak|orig)).*$`Dix';
+
+
+    /**
+     * Constructor.
+     *
+     * @param string $directory The directory to examine.
+     * @param string $rootPath  Path to the project root.
+     * @param string $filter    PCRE regular expression to filter the file list with.
+     */
+    public function __construct($directory, $rootPath='', $filter='')
+    {
+        $this->rootPath = $rootPath;
+
+        $directory = new RecursiveDirectoryIterator(
+            $directory,
+            RecursiveDirectoryIterator::UNIX_PATHS
+        );
+        $flattened = new RecursiveIteratorIterator(
+            $directory,
+            RecursiveIteratorIterator::LEAVES_ONLY,
+            RecursiveIteratorIterator::CATCH_GET_CHILD
+        );
+
+        if ($filter === '') {
+            $filter = sprintf($this->baseRegex, preg_quote($this->rootPath));
+        }
+
+        $this->fileIterator = new RegexIterator($flattened, $filter);
+
+        return $this;
+
+    }//end __construct()
+
+
+    /**
+     * Retrieve the filtered file list as an array.
+     *
+     * @return array
+     */
+    public function getList()
+    {
+        $fileList = [];
+
+        foreach ($this->fileIterator as $file) {
+            $fileList[] = str_replace($this->rootPath, '', $file);
+        }
+
+        return $fileList;
+
+    }//end getList()
+
+
+}//end class