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/tests/Parser/MonadTest.php

@@ -0,0 +1,80 @@
+<?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 Tests\Parsica\Parsica\Parser;
+
+use PHPUnit\Framework\TestCase;
+use Parsica\Parsica\PHPUnit\ParserAssertions;
+use function Parsica\Parsica\anySingle;
+use function Parsica\Parsica\bind;
+use function Parsica\Parsica\char;
+use function Parsica\Parsica\pure;
+use function Parsica\Parsica\sequence;
+
+final class MonadTest extends TestCase
+{
+    use ParserAssertions;
+
+    /** @test */
+    public function bind()
+    {
+        // This parser checks if the second character is the same as the first, by taking the output of the first
+        // parser and binding it to a function that produces the second parser from that output.
+        $parser = anySingle()->bind(fn(string $c) => char($c));
+        $this->assertParses("aa", $parser, "a");
+        $this->assertParses("bb", $parser, "b");
+        $this->assertParseFails("ab", $parser);
+
+        $parser = bind(anySingle(), fn(string $c) => char($c));
+        $this->assertParses("aa", $parser, "a");
+        $this->assertParses("bb", $parser, "b");
+        $this->assertParseFails("ab", $parser);
+    }
+
+    /** @test */
+    public function bind_fails()
+    {
+        // If the first parser fails, bind() returns the first one.
+        $parser = char('x')->bind(fn(string $c) => char($c));
+        $this->assertParses("xx", $parser, "x");
+        $this->assertParseFails("yx", $parser);
+    }
+
+    /** @test */
+    public function sequence()
+    {
+        $parser = char('a')->sequence(char('b'));
+        $this->assertParses("ab", $parser, "b");
+        $this->assertParseFails("aa", $parser);
+
+        $parser = sequence(char('a'), char('b'));
+        $this->assertParses("ab", $parser, "b");
+        $this->assertParseFails("aa", $parser);
+    }
+
+    /** @test */
+    public function sequence_error_should_show_the_label_of_the_failing_parser()
+    {
+        $parser = char('a')->sequence(char('b'));
+        $this->assertParseFails("X", $parser, "'a'");
+        $this->assertParseFails("aX", $parser, "'b'");
+
+    }
+
+    /** @test */
+    public function pure()
+    {
+        $parser = pure("hi");
+        $this->assertParses("something else", $parser, "hi");
+
+    }
+
+
+}