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/composer.json

@@ -0,0 +1,68 @@
+{
+    "name": "parsica-php/parsica",
+    "type": "library",
+    "description": "The easiest way to build robust parsers in PHP.",
+    "keywords": [
+        "parser",
+        "parser-combinator",
+        "parser combinator",
+        "parsing"
+    ],
+    "homepage": "https://parsica-php.github.io/",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Mathias Verraes",
+            "email": "mathias@verraes.net",
+            "homepage": "https://verraes.net"
+        },
+        {
+            "name": "Toon Daelman",
+            "email": "spinnewebber_toon@hotmail.com",
+            "homepage": "https://github.com/turanct"
+        }
+    ],
+    "require": {
+        "php": "^7.4 || ^8.0",
+        "ext-mbstring": "*"
+    },
+    "require-dev": {
+        "ext-json": "*",
+        "mathiasverraes/uptodocs": "dev-main",
+        "phpunit/phpunit": "^9.0",
+        "phpbench/phpbench": "^1.0.1",
+        "psr/event-dispatcher": "^1.0",
+        "vimeo/psalm": "^4.30"
+    },
+    "autoload": {
+        "psr-4": {
+            "Parsica\\Parsica\\": "src/"
+        },
+        "files": [
+            "src/characters.php",
+            "src/combinators.php",
+            "src/numeric.php",
+            "src/predicates.php",
+            "src/primitives.php",
+            "src/recursion.php",
+            "src/sideEffects.php",
+            "src/space.php",
+            "src/strings.php",
+            "src/Expression/expression.php",
+            "src/Internal/FP.php",
+            "src/Curry/functions.php"
+        ]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Tests\\Parsica\\Parsica\\": "tests/"
+        }
+    },
+    "scripts": {
+        "test": ["@phpunit", "@psalm", "@uptodocs"],
+        "phpunit": "vendor/bin/phpunit",
+        "psalm": "vendor/bin/psalm",
+        "uptodocs": "docs/testdocs",
+        "benchmark": "phpbench run benchmarks --report=aggregate"
+    }
+}