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/nette/utils/src/Iterators/Mapper.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+/**
+ * This file is part of the Nette Framework (https://nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+namespace Nette\Iterators;
+
+
+/**
+ * @deprecated use Nette\Utils\Iterables::map()
+ */
+class Mapper extends \IteratorIterator
+{
+	private \Closure $callback;
+
+
+	public function __construct(\Traversable $iterator, callable $callback)
+	{
+		parent::__construct($iterator);
+		$this->callback = $callback(...);
+	}
+
+
+	public function current(): mixed
+	{
+		return ($this->callback)(parent::current(), parent::key());
+	}
+}