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/PHPUnit/ParserTestCaseTest.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\PHPUnit;
+
+use PHPUnit\Framework\TestCase;
+use Parsica\Parsica\PHPUnit\ParserAssertions;
+
+final class ParserTestCaseTest extends TestCase
+{
+    use ParserAssertions;
+
+    /** @test */
+    public function strict_equality()
+    {
+        $this->assertEquals(1.23, "1.23",
+            "A string and a float are equal in php");
+        $this->assertNotSame(1.23, "1.23",
+            "A string and a float are not the same in php");
+        $this->assertSame(1.23, 1.23,
+            "Primitives are compared by value");
+        $this->assertEquals(new MyType(1.23), new MyType(1.23),
+            "Weak equality works for objects");
+        $this->assertNotSame(new MyType(1.23), new MyType(1.23),
+            "...but value object instances with the same value do not have equality");
+        $this->assertTrue((new MyType(1.23))->equals(new MyType(1.23)),
+            "We can solve it with an equals() method, but the user doesn't always have "
+            . "control of the types.");
+
+        $this->assertTrue(true,
+            "Therefore, we need something that will behave like assertSame for primitives, "
+            . "like assertEquals for objects of the same type,"
+            . "and fail for everything else.");
+
+        $this->assertStrictlyEquals(1.23, 1.23);
+        $this->assertStrictlyEquals(new MyType(1.23), new MyType(1.23));
+
+        /*
+        $this->assertStrictlyEquals(1.23, "1.23",
+            "should fail");
+        $this->assertStrictlyEquals("1.23", 1.23,
+            "should fail");
+        $this->assertStrictlyEquals(new MyType(1.23), new MyType(7.89),
+            "should fail");
+        */
+    }
+
+    /** @test */
+    public function strictlyEquals_for_arrays()
+    {
+        $this->assertStrictlyEquals(
+            [1, new MyType(5.0)],
+            [1, new MyType(5.0)]
+        );
+    }
+
+}
+
+final class MyType
+{
+    private float $x;
+
+    public function __construct(float $x)
+    {
+        $this->x = $x;
+    }
+
+    public function equals(MyType $other): bool
+    {
+        return $this->x === $other->x;
+    }
+
+}