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/src/Expression/RightAssoc.php

@@ -0,0 +1,86 @@
+<?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.
+ */
+
+namespace Parsica\Parsica\Expression;
+
+use Parsica\Parsica\Parser;
+use function Parsica\Parsica\Curry\curry;
+use function Parsica\Parsica\choice;
+use function Parsica\Parsica\collect;
+use function Parsica\Parsica\Internal\FP\foldr;
+use function Parsica\Parsica\keepFirst;
+use function Parsica\Parsica\many;
+use function Parsica\Parsica\map;
+use function Parsica\Parsica\pure;
+
+/**
+ * @internal
+ * @template TSymbol
+ * @template TExpressionAST
+ * @psalm-immutable
+ */
+final class RightAssoc implements ExpressionType
+{
+    /** @var non-empty-list<BinaryOperator<TSymbol, TExpressionAST>> */
+    private array $operators;
+
+    /**
+     * @internal
+     * @psalm-param non-empty-list<BinaryOperator<TSymbol, TExpressionAST>> $operators
+     * @psalm-pure
+     * @psalm-suppress ImpureVariable
+     */
+    function __construct(array $operators)
+    {
+        $this->operators = $operators;
+    }
+
+    /**
+     * @psalm-param Parser<TExpressionAST> $previousPrecedenceLevel
+     * @psalm-return Parser<TExpressionAST>
+     */
+    public function buildPrecedenceLevel(Parser $previousPrecedenceLevel): Parser
+    {
+        /**
+         * @psalm-var list<Parser<pure-callable(Parser<TExpressionAST>):Parser<TExpressionAST>>> $operatorParsers
+         */
+        $operatorParsers = [];
+        foreach ($this->operators as $operator) {
+            $operatorParsers[] =
+                pure(curry($operator->transform()))
+                    ->apply(keepFirst($previousPrecedenceLevel, $operator->symbol()))
+                    ->label($operator->label());
+        }
+
+        return map(
+            collect(
+                many(choice(...$operatorParsers)),
+                $previousPrecedenceLevel
+            ),
+
+            /**
+             * @psalm-param array{0: list<pure-callable(TExpressionAST):TExpressionAST>, 1: TExpressionAST} $o
+             * @psalm-return TExpressionAST
+             */
+            fn(array $o) => foldr(
+                $o[0],
+
+                /**
+                 * @psalm-param pure-callable(TExpressionAST):TExpressionAST $appl
+                 * @psalm-param TExpressionAST $acc
+                 * @psalm-return TExpressionAST
+                 */
+                fn(callable $appl, $acc) => $appl($acc),
+                $o[1]
+            )
+        );
+
+    }
+}