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/parsica-php/parsica/docs/before.php

@@ -0,0 +1,65 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the Parsica library.
+ *
+ * Copyright (c) 2020 Mathias Verraes <mathias@verraes.net>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/** @noinspection ALL */
+
+namespace Docs;
+
+// This code is executed by UpToDocs before each code block
+require_once __DIR__ . '/../vendor/autoload.php';
+
+use Parsica\Parsica\Parser;
+use Parsica\Parsica\ParserHasFailed;
+use Parsica\Parsica\StringStream;
+use function Parsica\Parsica\{alphaChar,
+    alphaNumChar,
+    atLeastOne,
+    between,
+    char,
+    charI,
+    choice,
+    collect,
+    digitChar,
+    either,
+    eof,
+    Expression\binaryOperator,
+    Expression\expression,
+    Expression\leftAssoc,
+    Expression\nonAssoc,
+    Expression\postfix,
+    Expression\prefix,
+    Expression\rightAssoc,
+    Expression\unaryOperator,
+    float,
+    isDigit,
+    isEqual,
+    isWhitespace,
+    keepFirst,
+    many,
+    notFollowedBy,
+    optional,
+    orPred,
+    punctuationChar,
+    recursive,
+    repeat,
+    satisfy,
+    sepBy,
+    sepBy1,
+    sequence,
+    skipHSpace,
+    skipSpace1,
+    some,
+    string,
+    stringI,
+    takeWhile,
+    upperChar,
+    whitespace,
+    zeroOrMore};
+use function PHPUnit\Framework\{assertEquals, assertFalse, assertInstanceOf, assertIsString, assertTrue, assertSame};