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/charactersTest.php

@@ -0,0 +1,125 @@
+<?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;
+
+use PHPUnit\Framework\TestCase;
+use Parsica\Parsica\Parser;
+use Parsica\Parsica\PHPUnit\ParserAssertions;
+use function Parsica\Parsica\{alphaChar,
+    alphaNumChar,
+    binDigitChar,
+    blank,
+    char,
+    charI,
+    controlChar,
+    digitChar,
+    hexDigitChar,
+    lowerChar,
+    octDigitChar,
+    printChar,
+    punctuationChar,
+    space,
+    string,
+    stringI,
+    tab,
+    upperChar,
+    whitespace};
+
+final class charactersTest extends TestCase
+{
+    use ParserAssertions;
+
+    /** @test */
+    public function char()
+    {
+        $this->assertParses("abc", char('a'), "a");
+        $this->assertRemainder("abc", char('a'), "bc");
+        $this->assertParseFails("bc", char('a'), "'a'");
+    }
+
+    /** @test */
+    public function charI()
+    {
+        $this->assertParses("abc", charI('a'), "a");
+        $this->assertParses("ABC", charI('a'), "A");
+    }
+
+    /** @test */
+    public function charI_label()
+    {
+        $this->assertParseFails("foo", charI('a'), "'a' or 'A'");
+        $this->assertParseFails("foo", charI('%'), "'%'");
+    }
+
+    /** @test */
+    public function string()
+    {
+        $this->assertParses("abcde", string('abc'), "abc");
+        $this->assertParseFails("babc", string('abc'), "'abc'");
+    }
+
+    /** @test */
+    public function stringI()
+    {
+        $parser = stringI('hello world');
+        $input = "hElLO WoRlD!!1!";
+        $expected = "hElLO WoRlD";
+        $this->assertParses($input, $parser, $expected, "stringI() should be case-preserving");
+        $this->assertRemainder($input, $parser, "!!1!");
+    }
+
+    public function characterParsers(): array
+    {
+        $tests = [
+            // dataSet => [Parser, example character]
+            'controlChar' => [controlChar(), mb_chr(0x05)],
+            'printChar_a' => [printChar(), "a"],
+            'printChar_%' => [printChar(), "%"],
+        ];
+
+
+        $types = [
+            // dataSet => [Parser, [example character]]
+            'upperChar' => [upperChar(), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"],
+            'lowerChar' => [lowerChar(), "abcdefghijklmnopqrstuvwxyz"],
+            'alphaChar' => [alphaChar(), "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"],
+            'alphaNumChar' => [alphaNumChar(), "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"],
+            'digitChar' => [digitChar(), "0123456789"],
+            'binDigitChar' => [binDigitChar(), "01"],
+            'octDigitChar' => [octDigitChar(), "01234567"],
+            'hexDigitChar' => [hexDigitChar(), "0123456789abcdefABCDEF"],
+            'punctuationChar' => [punctuationChar(), "!\"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"],
+            'whitespace' => [whitespace(), " \t\n\r\f\v"],
+            'space' => [space(), " "],
+            'tab' => [tab(), "\t"],
+            'blank' => [blank(), "\t "],
+        ];
+
+        foreach ($types as $name => [$parser, $chars]) {
+            foreach (mb_str_split($chars) as $char) {
+                $tests["{$name}: {$char}"] = [$parser, $char];
+            }
+        }
+
+        return $tests;
+
+    }
+
+    /**
+     * @test
+     * @dataProvider characterParsers
+     */
+    public function character_parsers(Parser $parser, string $example)
+    {
+        $this->assertParses($example, $parser, $example);
+    }
+}
+